diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/flow_kinds/lazy_array_range.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/flow_kinds/lazy_array_range.py
index 867fb1d..cc3da7d 100644
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/flow_kinds/lazy_array_range.py
+++ b/src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/flow_kinds/lazy_array_range.py
@@ -388,6 +388,12 @@ class LazyArrayRangeFlow:
 			self.stop.subs({sym: symbol_values[sym.name] for sym in self.symbols})
 		)
 
+	def realize_step_size(
+		self,
+		symbol_values: dict[spux.Symbol, typ.Any] = MappingProxyType({}),
+	) -> ArrayFlow | LazyValueFuncFlow:
+		return (self.realize_stop() - self.realize_start()) / self.steps
+
 	def realize(
 		self,
 		symbol_values: dict[spux.Symbol, typ.Any] = MappingProxyType({}),
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/node_types.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/node_types.py
index 4ffefc1..8e6826b 100644
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/node_types.py
+++ b/src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/node_types.py
@@ -55,10 +55,7 @@ class NodeType(blender_type_enum.BlenderTypeEnum):
 	JSONFileExporter = enum.auto()
 
 	# Sources
-	## Sources / Temporal Shapes
-	PulseTemporalShape = enum.auto()
-	WaveTemporalShape = enum.auto()
-	ExprTemporalShape = enum.auto()
+	TemporalShape = enum.auto()
 	## Sources /
 	PointDipoleSource = enum.auto()
 	PlaneWaveSource = enum.auto()
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/analysis/math/map_math.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/analysis/math/map_math.py
index 9f52c9e..b6a6cf0 100644
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/analysis/math/map_math.py
+++ b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/analysis/math/map_math.py
@@ -374,7 +374,7 @@ class MapMathNode(base.MaxwellSimNode):
 	# - Properties
 	####################
 	operation: MapOperation = bl_cache.BLField(
-		prop_ui=True, enum_cb=lambda self, _: self.search_operations()
+		enum_cb=lambda self, _: self.search_operations()
 	)
 
 	@property
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/analysis/viz.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/analysis/viz.py
index 050bd80..ed605a2 100644
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/analysis/viz.py
+++ b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/analysis/viz.py
@@ -22,7 +22,7 @@ import jaxtyping as jtyp
 import matplotlib.axis as mpl_ax
 import sympy as sp
 
-from blender_maxwell.utils import bl_cache, image_ops, logger
+from blender_maxwell.utils import bl_cache, image_ops, logger, sim_symbols
 from blender_maxwell.utils import extra_sympy_units as spux
 
 from ... import contracts as ct
@@ -210,8 +210,8 @@ class VizNode(base.MaxwellSimNode):
 	input_sockets: typ.ClassVar = {
 		'Expr': sockets.ExprSocketDef(
 			active_kind=ct.FlowKind.LazyValueFunc,
-			symbols={_x := sp.Symbol('x', real=True)},
-			default_value=2 * _x,
+			default_symbols=[sim_symbols.x],
+			default_value=2 * sim_symbols.x.sp_symbol,
 		),
 	}
 	output_sockets: typ.ClassVar = {
@@ -295,8 +295,8 @@ class VizNode(base.MaxwellSimNode):
 	####################
 	@events.on_value_changed(
 		socket_name='Expr',
-		input_sockets={'Expr'},
 		run_on_init=True,
+		input_sockets={'Expr'},
 		input_socket_kinds={'Expr': {ct.FlowKind.Info, ct.FlowKind.Params}},
 		input_sockets_optional={'Expr': True},
 	)
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/__init__.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/__init__.py
index 6a83d80..cb007d4 100644
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/__init__.py
+++ b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/__init__.py
@@ -19,11 +19,11 @@ from . import (
 	gaussian_beam_source,
 	plane_wave_source,
 	point_dipole_source,
-	temporal_shapes,
+	temporal_shape,
 )
 
 BL_REGISTER = [
-	*temporal_shapes.BL_REGISTER,
+	*temporal_shape.BL_REGISTER,
 	*plane_wave_source.BL_REGISTER,
 	*point_dipole_source.BL_REGISTER,
 	# *uniform_current_source.BL_REGISTER,
@@ -32,7 +32,7 @@ BL_REGISTER = [
 	# *tfsf_source.BL_REGISTER,
 ]
 BL_NODES = {
-	**temporal_shapes.BL_NODES,
+	**temporal_shape.BL_NODES,
 	**plane_wave_source.BL_NODES,
 	**point_dipole_source.BL_NODES,
 	# **uniform_current_source.BL_NODES,
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/plane_wave_source.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/plane_wave_source.py
index 994aca3..496881c 100644
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/plane_wave_source.py
+++ b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/plane_wave_source.py
@@ -28,6 +28,8 @@ from ... import contracts as ct
 from ... import managed_objs, sockets
 from .. import base, events
 
+log = logger.get(__name__)
+
 
 class PlaneWaveSourceNode(base.MaxwellSimNode):
 	"""An infinite-extent angled source simulating an plane wave with linear polarization.
@@ -73,7 +75,6 @@ class PlaneWaveSourceNode(base.MaxwellSimNode):
 	}
 
 	managed_obj_types: typ.ClassVar = {
-		'mesh': managed_objs.ManagedBLMesh,
 		'modifier': managed_objs.ManagedBLModifier,
 	}
 
@@ -132,18 +133,14 @@ class PlaneWaveSourceNode(base.MaxwellSimNode):
 		# Trigger
 		prop_name='preview_active',
 		# Loaded
-		managed_objs={'mesh'},
+		managed_objs={'modifier'},
 		props={'preview_active'},
 	)
 	def on_preview_changed(self, managed_objs, props):
-		"""Enables/disables previewing of the GeoNodes-driven mesh, regardless of whether a particular GeoNodes tree is chosen."""
-		mesh = managed_objs['mesh']
-
-		# Push Preview State to Managed Mesh
 		if props['preview_active']:
-			mesh.show_preview()
+			managed_objs['modifier'].show_preview()
 		else:
-			mesh.hide_preview()
+			managed_objs['modifier'].hide_preview()
 
 	@events.on_value_changed(
 		# Trigger
@@ -151,7 +148,7 @@ class PlaneWaveSourceNode(base.MaxwellSimNode):
 		prop_name={'injection_axis', 'injection_direction'},
 		run_on_init=True,
 		# Loaded
-		managed_objs={'mesh', 'modifier'},
+		managed_objs={'modifier'},
 		props={'injection_axis', 'injection_direction'},
 		input_sockets={'Temporal Shape', 'Center', 'Spherical', 'Pol ∡'},
 		unit_systems={'BlenderUnits': ct.UNITS_BLENDER},
@@ -162,7 +159,6 @@ class PlaneWaveSourceNode(base.MaxwellSimNode):
 	def on_inputs_changed(self, managed_objs, props, input_sockets, unit_systems):
 		# Push Input Values to GeoNodes Modifier
 		managed_objs['modifier'].bl_modifier(
-			managed_objs['mesh'].bl_object(location=input_sockets['Center']),
 			'NODES',
 			{
 				'node_group': import_geonodes(GeoNodes.SourcePlaneWave),
@@ -175,6 +171,7 @@ class PlaneWaveSourceNode(base.MaxwellSimNode):
 					'Pol Angle': input_sockets['Pol ∡'],
 				},
 			},
+			location=input_sockets['Center'],
 		)
 
 
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shape.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shape.py
new file mode 100644
index 0000000..242aa0b
--- /dev/null
+++ b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shape.py
@@ -0,0 +1,197 @@
+# blender_maxwell
+# Copyright (C) 2024 blender_maxwell Project Contributors
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Implements the `TemporalShapeNode`."""
+
+import typing as typ
+
+import bpy
+import sympy as sp
+import sympy.physics.units as spu
+import tidy3d as td
+
+from blender_maxwell.utils import extra_sympy_units as spux
+from blender_maxwell.utils import logger, sim_symbols
+
+from ... import contracts as ct
+from ... import managed_objs, sockets
+from .. import base, events
+
+log = logger.get(__name__)
+
+
+_max_e_socket_def = sockets.ExprSocketDef(
+	mathtype=spux.MathType.Complex,
+	physical_type=spux.PhysicalType.EField,
+	default_value=1 + 0j,
+)
+_offset_socket_def = sockets.ExprSocketDef(default_value=5, abs_min=2.5)
+
+
+class TemporalShapeNode(base.MaxwellSimNode):
+	"""Declare a source-time dependence for use in simulation source nodes."""
+
+	node_type = ct.NodeType.TemporalShape
+	bl_label = 'Temporal Shape'
+
+	####################
+	# - Sockets
+	####################
+	input_sockets: typ.ClassVar = {
+		'μ Freq': sockets.ExprSocketDef(
+			physical_type=spux.PhysicalType.Freq,
+			default_unit=spux.THz,
+			default_value=500,
+		),
+		'σ Freq': sockets.ExprSocketDef(
+			physical_type=spux.PhysicalType.Freq,
+			default_unit=spux.THz,
+			default_value=200,
+		),
+	}
+	input_socket_sets: typ.ClassVar = {
+		'Pulse': {
+			'max E': _max_e_socket_def,
+			'Offset Time': _offset_socket_def,
+			'Remove DC': sockets.BoolSocketDef(default_value=True),
+		},
+		'Constant': {
+			'max E': _max_e_socket_def,
+			'Offset Time': _offset_socket_def,
+		},
+		'Symbolic': {
+			't Range': sockets.ExprSocketDef(
+				active_kind=ct.FlowKind.LazyArrayRange,
+				physical_type=spux.PhysicalType.Time,
+				default_unit=spu.picosecond,
+				default_min=0,
+				default_max=10,
+				default_steps=100,
+			),
+			'Envelope': sockets.ExprSocketDef(
+				default_symbols=[sim_symbols.t_ps],
+				default_value=10 * sim_symbols.t_ps.sp_symbol,
+			),
+		},
+	}
+
+	output_sockets: typ.ClassVar = {
+		'Temporal Shape': sockets.MaxwellTemporalShapeSocketDef(),
+	}
+
+	managed_obj_types: typ.ClassVar = {
+		'plot': managed_objs.ManagedBLImage,
+	}
+
+	def draw_info(self, _: bpy.types.Context, layout: bpy.types.UILayout) -> None:
+		if self.active_socket_set != 'Symbolic':
+			box = layout.box()
+			row = box.row()
+			row.alignment = 'CENTER'
+			row.label(text='Parameter Scale')
+
+			# Split
+			split = box.split(factor=0.3, align=False)
+
+			## LHS: Parameter Names
+			col = split.column()
+			col.alignment = 'RIGHT'
+			col.label(text='Off t:')
+
+			## RHS: Parameter Units
+			col = split.column()
+			col.label(text='1 / 2π·σ(𝑓)')
+
+	####################
+	# - FlowKind: Value
+	####################
+	@events.computes_output_socket(
+		'Temporal Shape',
+		# Loaded
+		props={'active_socket_set'},
+		input_sockets={
+			'max E',
+			'μ Freq',
+			'σ Freq',
+			'Offset Time',
+			'Remove DC',
+			't Range',
+			'Envelope',
+		},
+		input_socket_kinds={
+			't Range': ct.FlowKind.LazyArrayRange,
+			'Envelope': ct.FlowKind.LazyValueFunc,
+		},
+		input_sockets_optional={
+			'max E': True,
+			'Offset Time': True,
+			'Remove DC': True,
+			't Range': True,
+			'Envelope': True,
+		},
+		unit_systems={'Tidy3DUnits': ct.UNITS_TIDY3D},
+		scale_input_sockets={
+			'max E': 'Tidy3DUnits',
+			'μ Freq': 'Tidy3DUnits',
+			'σ Freq': 'Tidy3DUnits',
+			't Range': 'Tidy3DUnits',
+			'Offset Time': 'Tidy3DUnits',
+		},
+	)
+	def compute_temporal_shape(
+		self, props, input_sockets, unit_systems
+	) -> td.GaussianPulse:
+		match props['active_socket_set']:
+			case 'Pulse':
+				return td.GaussianPulse(
+					amplitude=sp.re(input_sockets['max E']),
+					phase=sp.im(input_sockets['max E']),
+					freq0=input_sockets['μ Freq'],
+					fwidth=input_sockets['σ Freq'],
+					offset=input_sockets['Offset Time'],
+					remove_dc_component=input_sockets['Remove DC'],
+				)
+
+			case 'Constant':
+				return td.ContinuousWave(
+					amplitude=sp.re(input_sockets['max E']),
+					phase=sp.im(input_sockets['max E']),
+					freq0=input_sockets['μ Freq'],
+					fwidth=input_sockets['σ Freq'],
+					offset=input_sockets['Offset Time'],
+				)
+
+			case 'Symbolic':
+				lzrange = input_sockets['t Range']
+				envelope_ps = input_sockets['Envelope'].func_jax
+
+				return td.CustomSourceTime.from_values(
+					freq0=input_sockets['μ Freq'],
+					fwidth=input_sockets['σ Freq'],
+					values=envelope_ps(
+						lzrange.rescale_to_unit(spu.ps).realize_array.values
+					),
+					dt=input_sockets['t Range'].realize_step_size(),
+				)
+
+
+####################
+# - Blender Registration
+####################
+BL_REGISTER = [
+	TemporalShapeNode,
+]
+BL_NODES = {ct.NodeType.TemporalShape: (ct.NodeCategory.MAXWELLSIM_SOURCES)}
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/__init__.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/__init__.py
deleted file mode 100644
index 673c2d3..0000000
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/__init__.py
+++ /dev/null
@@ -1,29 +0,0 @@
-# blender_maxwell
-# Copyright (C) 2024 blender_maxwell Project Contributors
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# from . import expr_temporal_shape, pulse_temporal_shape, wave_temporal_shape
-from . import pulse_temporal_shape, wave_temporal_shape
-
-BL_REGISTER = [
-	*pulse_temporal_shape.BL_REGISTER,
-	*wave_temporal_shape.BL_REGISTER,
-	# *expr_temporal_shape.BL_REGISTER,
-]
-BL_NODES = {
-	**pulse_temporal_shape.BL_NODES,
-	**wave_temporal_shape.BL_NODES,
-	# **expr_temporal_shape.BL_NODES,
-}
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/expr_temporal_shape.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/expr_temporal_shape.py
deleted file mode 100644
index 5b7d824..0000000
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/expr_temporal_shape.py
+++ /dev/null
@@ -1,21 +0,0 @@
-# blender_maxwell
-# Copyright (C) 2024 blender_maxwell Project Contributors
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-####################
-# - Blender Registration
-####################
-BL_REGISTER = []
-BL_NODES = {}
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/pulse_temporal_shape.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/pulse_temporal_shape.py
deleted file mode 100644
index b55e39c..0000000
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/pulse_temporal_shape.py
+++ /dev/null
@@ -1,177 +0,0 @@
-# blender_maxwell
-# Copyright (C) 2024 blender_maxwell Project Contributors
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-"""Implements the `PulseTemporalShapeNode`."""
-
-import functools
-import typing as typ
-
-import bpy
-import sympy as sp
-import sympy.physics.units as spu
-import tidy3d as td
-
-from blender_maxwell.utils import extra_sympy_units as spux
-
-from .... import contracts as ct
-from .... import managed_objs, sockets
-from ... import base, events
-
-
-class PulseTemporalShapeNode(base.MaxwellSimNode):
-	node_type = ct.NodeType.PulseTemporalShape
-	bl_label = 'Gaussian Pulse Temporal Shape'
-
-	####################
-	# - Sockets
-	####################
-	input_sockets: typ.ClassVar = {
-		'max E': sockets.ExprSocketDef(
-			mathtype=spux.MathType.Complex,
-			physical_type=spux.PhysicalType.EField,
-			default_value=1 + 0j,
-		),
-		'μ Freq': sockets.ExprSocketDef(
-			physical_type=spux.PhysicalType.Freq,
-			default_unit=spux.THz,
-			default_value=500,
-		),
-		'σ Freq': sockets.ExprSocketDef(
-			physical_type=spux.PhysicalType.Freq,
-			default_unit=spux.THz,
-			default_value=200,
-		),
-		'Offset Time': sockets.ExprSocketDef(default_value=5, abs_min=2.5),
-		'Remove DC': sockets.BoolSocketDef(
-			default_value=True,
-		),
-	}
-	output_sockets: typ.ClassVar = {
-		'Temporal Shape': sockets.MaxwellTemporalShapeSocketDef(),
-		'E(t)': sockets.ExprSocketDef(active_kind=ct.FlowKind.Array),
-	}
-
-	managed_obj_types: typ.ClassVar = {
-		'plot': managed_objs.ManagedBLImage,
-	}
-
-	####################
-	# - UI
-	####################
-	def draw_info(self, _: bpy.types.Context, layout: bpy.types.UILayout) -> None:
-		box = layout.box()
-		row = box.row()
-		row.alignment = 'CENTER'
-		row.label(text='Parameter Scale')
-
-		# Split
-		split = box.split(factor=0.3, align=False)
-
-		## LHS: Parameter Names
-		col = split.column()
-		col.alignment = 'RIGHT'
-		col.label(text='Off t:')
-
-		## RHS: Parameter Units
-		col = split.column()
-		col.label(text='1 / 2π·σ(𝑓)')
-
-	####################
-	# - FlowKind: Value
-	####################
-	@events.computes_output_socket(
-		'Temporal Shape',
-		input_sockets={
-			'max E',
-			'μ Freq',
-			'σ Freq',
-			'Offset Time',
-			'Remove DC',
-		},
-		unit_systems={'Tidy3DUnits': ct.UNITS_TIDY3D},
-		scale_input_sockets={
-			'max E': 'Tidy3DUnits',
-			'μ Freq': 'Tidy3DUnits',
-			'σ Freq': 'Tidy3DUnits',
-		},
-	)
-	def compute_temporal_shape(self, input_sockets, unit_systems) -> td.GaussianPulse:
-		return td.GaussianPulse(
-			amplitude=sp.re(input_sockets['max E']),
-			phase=sp.im(input_sockets['max E']),
-			freq0=input_sockets['μ Freq'],
-			fwidth=input_sockets['σ Freq'],
-			offset=input_sockets['Offset Time'],
-			remove_dc_component=input_sockets['Remove DC'],
-		)
-
-	####################
-	# - FlowKind: LazyValueFunc / Info / Params
-	####################
-	@events.computes_output_socket(
-		'E(t)',
-		kind=ct.FlowKind.LazyValueFunc,
-		output_sockets={'Temporal Shape'},
-	)
-	def compute_time_to_efield_lazy(self, output_sockets) -> td.GaussianPulse:
-		temporal_shape = output_sockets['Temporal Shape']
-		jax_amp_time = functools.partial(ct.manual_amp_time, temporal_shape)
-
-		## TODO: Don't just partial() it up, do it property in the ParamsFlow!
-		## -> Right now it's recompiled every time.
-
-		return ct.LazyValueFuncFlow(
-			func=jax_amp_time,
-			func_args=[spux.PhysicalType.Time],
-			supports_jax=True,
-		)
-
-	@events.computes_output_socket(
-		'E(t)',
-		kind=ct.FlowKind.Info,
-	)
-	def compute_time_to_efield_info(self) -> td.GaussianPulse:
-		return ct.InfoFlow(
-			dim_names=['t'],
-			dim_idx={
-				't': ct.LazyArrayRangeFlow(
-					start=sp.S(0), stop=sp.oo, steps=0, unit=spu.second
-				)
-			},
-			output_name='E',
-			output_shape=None,
-			output_mathtype=spux.MathType.Complex,
-			output_unit=spu.volt / spu.um,
-		)
-
-	@events.computes_output_socket(
-		'E(t)',
-		kind=ct.FlowKind.Params,
-	)
-	def compute_time_to_efield_params(self) -> td.GaussianPulse:
-		sym_time = sp.Symbol('t', real=True, nonnegative=True)
-		return ct.ParamsFlow(func_args=[sym_time], symbols={sym_time})
-
-
-####################
-# - Blender Registration
-####################
-BL_REGISTER = [
-	PulseTemporalShapeNode,
-]
-BL_NODES = {
-	ct.NodeType.PulseTemporalShape: (ct.NodeCategory.MAXWELLSIM_SOURCES_TEMPORALSHAPES)
-}
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/wave_temporal_shape.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/wave_temporal_shape.py
deleted file mode 100644
index 10eb77f..0000000
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/sources/temporal_shapes/wave_temporal_shape.py
+++ /dev/null
@@ -1,169 +0,0 @@
-# blender_maxwell
-# Copyright (C) 2024 blender_maxwell Project Contributors
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-"""Implements the `WaveTemporalShapeNode`."""
-
-import functools
-import typing as typ
-
-import bpy
-import sympy as sp
-import sympy.physics.units as spu
-import tidy3d as td
-
-from blender_maxwell.utils import extra_sympy_units as spux
-
-from .... import contracts as ct
-from .... import managed_objs, sockets
-from ... import base, events
-
-
-class WaveTemporalShapeNode(base.MaxwellSimNode):
-	node_type = ct.NodeType.WaveTemporalShape
-	bl_label = 'Continuous Wave Temporal Shape'
-
-	####################
-	# - Sockets
-	####################
-	input_sockets: typ.ClassVar = {
-		'max E': sockets.ExprSocketDef(
-			mathtype=spux.MathType.Complex,
-			physical_type=spux.PhysicalType.EField,
-			default_value=1 + 0j,
-		),
-		'μ Freq': sockets.ExprSocketDef(
-			physical_type=spux.PhysicalType.Freq,
-			default_unit=spux.THz,
-			default_value=500,
-		),
-		'σ Freq': sockets.ExprSocketDef(
-			physical_type=spux.PhysicalType.Freq,
-			default_unit=spux.THz,
-			default_value=200,
-		),
-		'Offset Time': sockets.ExprSocketDef(default_value=5, abs_min=2.5),
-	}
-	output_sockets: typ.ClassVar = {
-		'Temporal Shape': sockets.MaxwellTemporalShapeSocketDef(),
-		'E(t)': sockets.ExprSocketDef(active_kind=ct.FlowKind.Array),
-	}
-
-	managed_obj_types: typ.ClassVar = {
-		'plot': managed_objs.ManagedBLImage,
-	}
-
-	####################
-	# - UI
-	####################
-	def draw_info(self, _: bpy.types.Context, layout: bpy.types.UILayout) -> None:
-		box = layout.box()
-		row = box.row()
-		row.alignment = 'CENTER'
-		row.label(text='Parameter Scale')
-
-		# Split
-		split = box.split(factor=0.3, align=False)
-
-		## LHS: Parameter Names
-		col = split.column()
-		col.alignment = 'RIGHT'
-		col.label(text='Off t:')
-
-		## RHS: Parameter Units
-		col = split.column()
-		col.label(text='1 / 2π·σ(𝑓)')
-
-	####################
-	# - FlowKind: Value
-	####################
-	@events.computes_output_socket(
-		'Temporal Shape',
-		input_sockets={
-			'max E',
-			'μ Freq',
-			'σ Freq',
-			'Offset Time',
-		},
-		unit_systems={'Tidy3DUnits': ct.UNITS_TIDY3D},
-		scale_input_sockets={
-			'max E': 'Tidy3DUnits',
-			'μ Freq': 'Tidy3DUnits',
-			'σ Freq': 'Tidy3DUnits',
-		},
-	)
-	def compute_temporal_shape(self, input_sockets, unit_systems) -> td.GaussianPulse:
-		return td.ContinuousWave(
-			amplitude=sp.re(input_sockets['max E']),
-			phase=sp.im(input_sockets['max E']),
-			freq0=input_sockets['μ Freq'],
-			fwidth=input_sockets['σ Freq'],
-			offset=input_sockets['Offset Time'],
-		)
-
-	####################
-	# - FlowKind: LazyValueFunc / Info / Params
-	####################
-	@events.computes_output_socket(
-		'E(t)',
-		kind=ct.FlowKind.LazyValueFunc,
-		output_sockets={'Temporal Shape'},
-	)
-	def compute_time_to_efield_lazy(self, output_sockets) -> td.GaussianPulse:
-		temporal_shape = output_sockets['Temporal Shape']
-		jax_amp_time = functools.partial(ct.manual_amp_time, temporal_shape)
-
-		return ct.LazyValueFuncFlow(
-			func=jax_amp_time,
-			func_args=[spux.PhysicalType.Time],
-			supports_jax=True,
-		)
-
-	@events.computes_output_socket(
-		'E(t)',
-		kind=ct.FlowKind.Info,
-	)
-	def compute_time_to_efield_info(self) -> td.GaussianPulse:
-		return ct.InfoFlow(
-			dim_names=['t'],
-			dim_idx={
-				't': ct.LazyArrayRangeFlow(
-					start=sp.S(0), stop=sp.oo, steps=0, unit=spu.second
-				)
-			},
-			output_name='E',
-			output_shape=None,
-			output_mathtype=spux.MathType.Complex,
-			output_unit=spu.volt / spu.um,
-		)
-
-	@events.computes_output_socket(
-		'E(t)',
-		kind=ct.FlowKind.Params,
-	)
-	def compute_time_to_efield_params(self) -> td.GaussianPulse:
-		sym_time = sp.Symbol('t', real=True, nonnegative=True)
-		return ct.ParamsFlow(func_args=[sym_time], symbols={sym_time})
-
-
-####################
-# - Blender Registration
-####################
-BL_REGISTER = [
-	WaveTemporalShapeNode,
-]
-BL_NODES = {
-	ct.NodeType.WaveTemporalShape: (ct.NodeCategory.MAXWELLSIM_SOURCES_TEMPORALSHAPES)
-}
diff --git a/src/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/expr.py b/src/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/expr.py
index 0d5f673..4a3925a 100644
--- a/src/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/expr.py
+++ b/src/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/expr.py
@@ -23,7 +23,7 @@ import bpy
 import pydantic as pyd
 import sympy as sp
 
-from blender_maxwell.utils import bl_cache, logger
+from blender_maxwell.utils import bl_cache, logger, sim_symbols
 from blender_maxwell.utils import extra_sympy_units as spux
 
 from .. import contracts as ct
@@ -936,8 +936,11 @@ class ExprSocketDef(base.SocketDef):
 	physical_type: spux.PhysicalType = spux.PhysicalType.NonPhysical
 
 	default_unit: spux.Unit | None = None
-	# symbols: list[sim_symbols.SimSymbol] = frozenset()
-	symbols: frozenset[spux.SympyExpr] = frozenset()
+	default_symbols: list[sim_symbols.SimSymbol] = pyd.Field(default_factory=list)
+
+	@property
+	def symbols(self) -> set[sp.Symbol]:
+		return {sim_symbol.sp_symbol for sim_symbol in self.default_symbols}
 
 	# FlowKind: Value
 	default_value: spux.SympyExpr = 0
diff --git a/src/blender_maxwell/utils/extra_sympy_units.py b/src/blender_maxwell/utils/extra_sympy_units.py
index 13106e1..4d6eb38 100644
--- a/src/blender_maxwell/utils/extra_sympy_units.py
+++ b/src/blender_maxwell/utils/extra_sympy_units.py
@@ -173,6 +173,17 @@ class MathType(enum.StrEnum):
 			MT.Complex: complex,
 		}[self]
 
+	@property
+	def symbolic_set(self) -> type:
+		MT = MathType
+		return {
+			MT.Bool: sp.Set([sp.S(False), sp.S(True)]),
+			MT.Integer: sp.Integers,
+			MT.Rational: sp.Rationals,
+			MT.Real: sp.Reals,
+			MT.Complex: sp.Complexes,
+		}[self]
+
 	@staticmethod
 	def to_str(value: typ.Self) -> type:
 		return {
diff --git a/src/blender_maxwell/utils/sim_symbols.py b/src/blender_maxwell/utils/sim_symbols.py
index a090c6f..ab3b26e 100644
--- a/src/blender_maxwell/utils/sim_symbols.py
+++ b/src/blender_maxwell/utils/sim_symbols.py
@@ -16,6 +16,7 @@
 
 import dataclasses
 import enum
+import sys
 import typing as typ
 
 import sympy as sp
@@ -23,9 +24,19 @@ import sympy as sp
 from . import extra_sympy_units as spux
 
 
-class SimSymbolNames(enum.StrEnum):
+####################
+# - Simulation Symbols
+####################
+class SimSymbolName(enum.StrEnum):
 	LowerA = enum.auto()
-	LowerLambda = enum.auto()
+	LowerT = enum.auto()
+	LowerX = enum.auto()
+	LowerY = enum.auto()
+	LowerZ = enum.auto()
+
+	# Physics
+	Wavelength = enum.auto()
+	Frequency = enum.auto()
 
 	@staticmethod
 	def to_name(v: typ.Self) -> str:
@@ -37,11 +48,28 @@ class SimSymbolNames(enum.StrEnum):
 		Returns:
 			A human-friendly name corresponding to the enum value.
 		"""
-		SSN = SimSymbolNames
+		return SimSymbolName(v).name
+
+	@property
+	def name(self) -> str:
+		SSN = SimSymbolName
 		return {
 			SSN.LowerA: 'a',
-			SSN.LowerLambda: 'λ',
-		}[v]
+			SSN.LowerT: 't',
+			SSN.LowerX: 'x',
+			SSN.LowerY: 'y',
+			SSN.LowerZ: 'z',
+			SSN.Wavelength: 'wl',
+			SSN.Frequency: 'freq',
+		}[self]
+
+	@property
+	def name_pretty(self) -> str:
+		SSN = SimSymbolName
+		return {
+			SSN.Wavelength: 'λ',
+			SSN.Frequency: '𝑓',
+		}.get(self, self.name)
 
 	@staticmethod
 	def to_icon(_: typ.Self) -> str:
@@ -58,19 +86,214 @@ class SimSymbolNames(enum.StrEnum):
 
 @dataclasses.dataclass(kw_only=True, frozen=True)
 class SimSymbol:
-	name: SimSymbolNames = SimSymbolNames.LowerLambda
+	"""A declarative representation of a symbolic variable.
+
+	`sympy`'s symbols aren't quite flexible enough for our needs: The symbols that we're transporting often need exact domain information, an associated unit dimension, and a great deal of determinism in checks thereof.
+
+	This dataclass is UI-friendly, as it only uses field type annotations/defaults supported by `bl_cache.BLProp`.
+	It's easy to persist, easy to transport, and has many helpful properties which greatly simplify working with symbols.
+	"""
+
+	sim_node_name: SimSymbolName = SimSymbolName.LowerX
 	mathtype: spux.MathType = spux.MathType.Real
 
-	## TODO:
-	## -> Physical Type: Track unit dimension information on the side.
-	## -> Domain: Ability to constrain mathtype ex. (-pi,pi]
-	## -> Shape: For using sp.MatrixSymbol w/predefined rows/cols.
+	physical_type: spux.PhysicalType = spux.PhysicalType.NonPhysical
+
+	## TODO: Shape/size support? Incl. MatrixSymbol.
+
+	# Domain
+	interval_finite: tuple[float, float] = (0, 1)
+	interval_inf: tuple[bool, bool] = (True, True)
+	interval_closed: tuple[bool, bool] = (False, False)
+
+	####################
+	# - Properties
+	####################
+	@property
+	def domain(self) -> sp.Interval | sp.Set:
+		"""Return the domain of valid values for the symbol.
+
+		For integer/rational/real symbols, the domain is an interval defined using the `interval_*` properties.
+		This interval **must** have the property`start <= stop`.
+
+		Otherwise, the domain is the symbolic set corresponding to `self.mathtype`.
+		"""
+		if self.mathtype in [
+			spux.MathType.Integer,
+			spux.MathType.Rational,
+			spux.MathType.Real,
+		]:
+			return sp.Interval(
+				start=self.interval_finite[0] if not self.interval_inf[0] else -sp.oo,
+				end=self.interval_finite[1] if not self.interval_inf[1] else sp.oo,
+				left_open=(
+					True if self.interval_inf[0] else not self.interval_closed[0]
+				),
+				right_open=(
+					True if self.interval_inf[1] else not self.interval_closed[1]
+				),
+			)
+
+		return self.mathtype.symbolic_set
+
+	####################
+	# - Properties
+	####################
+	@property
+	def sp_symbol(self) -> sp.Symbol:
+		"""Return a symbolic variable corresponding to this `SimSymbol`.
+
+		As much as possible, appropriate `assumptions` are set in the constructor of `sp.Symbol`, insofar as they can be determined.
+
+		However, the assumptions system alone is rather limited, and implementations should therefore also strongly consider transporting `SimSymbols` directly, instead of `sp.Symbol`.
+		This allows making use of other properties like `self.domain`, when appropriate.
+		"""
+		# MathType Domain Constraint
+		## -> We must feed the assumptions system.
+		mathtype_kwargs = {}
+		match self.mathtype:
+			case spux.MathType.Integer:
+				mathtype_kwargs |= {'integer': True}
+			case spux.MathType.Rational:
+				mathtype_kwargs |= {'rational': True}
+			case spux.MathType.Real:
+				mathtype_kwargs |= {'real': True}
+			case spux.MathType.Complex:
+				mathtype_kwargs |= {'complex': True}
+
+		# Interval Constraints
+		if isinstance(self.domain, sp.Interval):
+			# Assumption: Non-Zero
+			if (
+				(
+					self.domain.left == 0
+					and self.domain.left_open
+					or self.domain.right == 0
+					and self.domain.right_open
+				)
+				or self.domain.left > 0
+				or self.domain.right < 0
+			):
+				mathtype_kwargs |= {'nonzero': True}
+
+			# Assumption: Positive/Negative
+			if self.domain.left >= 0:
+				mathtype_kwargs |= {'positive': True}
+			elif self.domain.right <= 0:
+				mathtype_kwargs |= {'negative': True}
+
+		# Construct the Symbol
+		return sp.Symbol(self.sim_node_name.name, **mathtype_kwargs)
+
+
+####################
+# - Common Sim Symbols
+####################
+class CommonSimSymbol(enum.StrEnum):
+	"""A set of pre-defined symbols that might commonly be used in the context of physical simulation.
+
+	Each entry maps directly to a particular `SimSymbol`.
+
+	The enum is compatible with `BLField`, making it easy to declare a UI-driven dropdown of symbols that behave as expected.
+
+	Attributes:
+		Wavelength: A symbol representing a real-valued wavelength.
+			Implicitly, this symbol often represents "vacuum wavelength" in particular.
+		Wavelength: A symbol representing a real-valued frequency.
+			Generally, this is the non-angular frequency.
+	"""
+
+	X = enum.auto()
+	TimePS = enum.auto()
+	WavelengthNM = enum.auto()
+	FrequencyTHZ = enum.auto()
+
+	@staticmethod
+	def to_name(v: typ.Self) -> str:
+		"""Convert the enum value to a human-friendly name.
+
+		Notes:
+			Used to print names in `EnumProperty`s based on this enum.
+
+		Returns:
+			A human-friendly name corresponding to the enum value.
+		"""
+		return CommonSimSymbol(v).sim_symbol_name.name
+
+	@staticmethod
+	def to_icon(_: typ.Self) -> str:
+		"""Convert the enum value to a Blender icon.
+
+		Notes:
+			Used to print icons in `EnumProperty`s based on this enum.
+
+		Returns:
+			A human-friendly name corresponding to the enum value.
+		"""
+		return ''
+
+	####################
+	# - Properties
+	####################
+	@property
+	def sim_symbol_name(self) -> str:
+		SSN = SimSymbolName
+		CSS = CommonSimSymbol
+		return {
+			CSS.X: SSN.LowerX,
+			CSS.TimePS: SSN.LowerT,
+			CSS.WavelengthNM: SSN.Wavelength,
+			CSS.FrequencyTHZ: SSN.Frequency,
+		}[self]
 
 	@property
-	def sp_symbol(self):
-		mathtype_kwarg = {}
-		match self.mathtype:
-			case spux.MathType.Real:
-				mathtype_kwarg = {}
+	def sim_symbol(self) -> SimSymbol:
+		"""Retrieve the `SimSymbol` associated with the `CommonSimSymbol`."""
+		CSS = CommonSimSymbol
+		return {
+			CSS.X: SimSymbol(
+				sim_node_name=self.sim_symbol_name,
+				mathtype=spux.MathType.Real,
+				physical_type=spux.PhysicalType.NonPhysical,
+				## TODO: Unit of Picosecond
+				interval_finite=(sys.float_info.min, sys.float_info.max),
+				interval_inf=(True, True),
+				interval_closed=(False, False),
+			),
+			CSS.TimePS: SimSymbol(
+				sim_node_name=self.sim_symbol_name,
+				mathtype=spux.MathType.Real,
+				physical_type=spux.PhysicalType.Time,
+				## TODO: Unit of Picosecond
+				interval_finite=(0, sys.float_info.max),
+				interval_inf=(False, True),
+				interval_closed=(True, False),
+			),
+			CSS.WavelengthNM: SimSymbol(
+				sim_node_name=self.sim_symbol_name,
+				mathtype=spux.MathType.Real,
+				physical_type=spux.PhysicalType.Length,
+				## TODO: Unit of Picosecond
+				interval_finite=(0, sys.float_info.max),
+				interval_inf=(False, True),
+				interval_closed=(False, False),
+			),
+			CSS.FrequencyTHZ: SimSymbol(
+				sim_node_name=self.sim_symbol_name,
+				mathtype=spux.MathType.Real,
+				physical_type=spux.PhysicalType.Freq,
+				## TODO: Unit of THz
+				interval_finite=(0, sys.float_info.max),
+				interval_inf=(False, True),
+				interval_closed=(False, False),
+			),
+		}[self]
 
-		return sp.Symbol(self.name, **mathtype_kwarg)
+
+####################
+# - Selected Direct Access
+####################
+x = CommonSimSymbol.X.sim_symbol
+t_ps = CommonSimSymbol.TimePS.sim_symbol
+wl_nm = CommonSimSymbol.WavelengthNM.sim_symbol
+freq_thz = CommonSimSymbol.FrequencyTHZ.sim_symbol