user: What is Index – U and how is it used in Blender Python scripting?

assistant: .ParticleSettings attribute)](bpy.types.ParticleSettings.html#bpy.types.ParticleSettings.use_absolute_path_time) - [use_absolute_resolution (bpy.types.AreaLight attribute)](bpy.types.AreaLight.html#bpy.types.AreaLight.use_absolute_resolution)   - [(bpy.types.PointLight attribute)](bpy.types.PointLight.html#bpy.types.PointLight.use_absolute_resolution)   - [(bpy.types.SpotLight attribute)](bpy.types.SpotLight.html#bpy.types.SpotLight.use_absolute_resolution) - [use_absolute_tracking (bpy.types.XrSessionSettings attribute)](bpy.types.XrSessionSettings.html#bpy.types.XrSessionSettings.use_absolute_tracking) - [use_absorption (bpy.types.FieldSettings attribute)](bpy.types.FieldSettings.html#bpy.types.FieldSettings.use_absorption) - [use_access_token (bpy.types.UserExtensionRepo attribute)](bpy.types.UserExtensionRepo.html#bpy.types.UserExtensionRepo.use_access_token) - [use_accumulate (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_accumulate) - [use_active_clip (bpy.types.CameraSolverConstraint attribute)](bpy.types.CameraSolverConstraint.html#bpy.types.CameraSolverConstraint.use_active_clip)   - [(bpy.types.FollowTrackConstraint attribute)](bpy.types.FollowTrackConstraint.html#bpy.types.FollowTrackConstraint.use_active_clip)   - [(bpy.types.ObjectSolverConstraint attribute)](bpy.types.ObjectSolverConstraint.html#bpy.types.ObjectSolverConstraint.use_active_clip) - [use_active_layer_only (bpy.types.BrushGpencilSettings attribute)](bpy.types.BrushGpencilSettings.html#bpy.types.BrushGpencilSettings.use_active_layer_only) - [use_adaptive_domain (bpy.types.FluidDomainSettings attribute)](bpy.types.FluidDomainSettings.html#bpy.types.FluidDomainSettings.use_adaptive_domain) - [use_adaptive_space (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_adaptive_space) - [use_adaptive_subdivision (bpy.types.SubsurfModifier attribute)](bpy.types.SubsurfModifier.html#bpy.types.SubsurfModifier.use_adaptive_subdivision) - [use_adaptive_subframes (bpy.types.ParticleSettings attribute)](bpy.types.ParticleSettings.html#bpy.types.ParticleSettings.use_adaptive_subframes) - [use_adaptive_timesteps (bpy.types.FluidDomainSettings attribute)](bpy.types.FluidDomainSettings.html#bpy.types.FluidDomainSettings.use_adaptive_timesteps) - [use_add (bpy.types.CopyScaleConstraint attribute)](bpy.types.CopyScaleConstraint.html#bpy.types.CopyScaleConstraint.use_add)   - [(bpy.types.VertexWeightEditModifier attribute)](bpy.types.VertexWeightEditModifier.html#bpy.types.VertexWeightEditModifier.use_add) - [use_additive (bpy.types.FModifierFunctionGenerator attribute)](bpy.types.FModifierFunctionGenerator.html#bpy.types.FModifierFunctionGenerator.use_additive)   - [(bpy.types.FModifierGenerator attribute)](bpy.types.FModifierGenerator.html#bpy.types.FModifierGenerator.use_additive) - [use_advanced_hair (bpy.types.ParticleSettings attribute)](bpy.types.ParticleSettings.html#bpy.types.ParticleSettings.use_advanced_hair) - [use_airbrush (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_airbrush) - [use_all_curves (bpy.types.GeometryNodeSampleCurve attribute)](bpy.types.GeometryNodeSampleCurve.html#bpy.types.GeometryNodeSampleCurve.use_all_curves) - [use_all_linked_data_direct (bpy.types.PreferencesExperimental attribute)](bpy.types.PreferencesExperimental.html#bpy.types.PreferencesExperimental.use_all_linked_data_direct) - [use_alpha (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_alpha)   - [(bpy.types.ImageTexture attribute)](bpy.types.ImageTexture.html#bpy.types.ImageTexture.use_alpha)   - [(bpy.types.ShaderNodeMixRGB attribute)](bpy.types.ShaderNodeMixRGB.html#bpy.types.ShaderNodeMixRGB.use_alpha)   - [(bpy.types.ShaderNodeOutputLineStyle attribute)](bpy.types.ShaderNodeOutputLineStyle.html#bpy.types.ShaderNodeOutputLineStyle.use_alpha)   - [(bpy.types.TextureNodeMixRGB attribute)](bpy.types.TextureNodeMixRGB.html#bpy.types.TextureNodeMixRGB.use_alpha) - [use_alpha_preview (bpy.types.MovieTrackingTrack attribute)](bpy.types.MovieTrackingTrack.html#bpy.types.MovieTrackingTrack.use_alpha_preview) - [use_anchor (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_anchor) - [use_angle_max (bpy.types.FreestyleLineStyle attribute)](bpy.types.FreestyleLineStyle.html#bpy.types.FreestyleLineStyle.use_angle_max) - [use_angle_min (bpy.types.FreestyleLineStyle attribute)](bpy.types.FreestyleLineStyle.html#bpy.types.FreestyleLineStyle.use_angle_min) - [use_anim_channel_group_colors (bpy.types.PreferencesEdit attribute)](bpy.types.PreferencesEdit.html#bpy.types.PreferencesEdit.use_anim_channel_group_colors) - [use_animated_influence (bpy.types.NlaStrip attribute)](bpy.types.NlaStrip.html#bpy.types.NlaStrip.use_animated_influence) - [use_animated_time (bpy.types.NlaStrip attribute)](bpy.types.NlaStrip.html#bpy.types.NlaStrip.use_animated_time) - [use_animated_time_cyclic (bpy.types.NlaStrip attribute)](bpy.types.NlaStrip.html#bpy.types.NlaStrip.use_animated_time_cyclic) - [use_annotation_onion_skinning (bpy.types.AnnotationLayer attribute)](bpy.types.AnnotationLayer.html#bpy.types.AnnotationLayer.use_annotation_onion_skinning) - [use_annotation_project_only_selected (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.use_annotation_project_only_selected) - [use_annotation_stroke_endpoints (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.use_annotation_stroke_endpoints) - [use_annotations (bpy.types.SceneStrip attribute)](bpy.types.SceneStrip.html#bpy.types.SceneStrip.use_annotations) - [use_antialiasing (bpy.types.DynamicPaintSurface attribute)](bpy.types.DynamicPaintSurface.html#bpy.types.DynamicPaintSurface.use_antialiasing)   - [(bpy.types.ShaderFxPixel attribute)](bpy.types.ShaderFxPixel.html#bpy.types.ShaderFxPixel.use_antialiasing) - [use_ao (bpy.types.ViewLayer attribute)](bpy.types.ViewLayer.html#bpy.types.ViewLayer.use_ao) - [use_apply_on_spline (bpy.types.Modifier attribute)](bpy.types.Modifier.html#bpy.types.Modifier.use_apply_on_spline) - [use_asset_indexing (bpy.types.PreferencesExperimental attribute)](bpy.types.PreferencesExperimental.html#bpy.types.PreferencesExperimental.use_asset_indexing) - [use_asymmetric (bpy.types.LineStyleThicknessModifier_Noise attribute)](bpy.types.LineStyleThicknessModifier_Noise.html#bpy.types.LineStyleThicknessModifier_Noise.use_asymmetric) - [use_audio (bpy.types.Scene attribute)](bpy.types.Scene.html#bpy.types.Scene.use_audio) - [use_audio_scrub (bpy.types.Scene attribute)](bpy.types.Scene.html#bpy.types.Scene.use_audio_scrub) - [use_auto_blend (bpy.types.NlaStrip attribute)](bpy.types.NlaStrip.html#bpy.types.NlaStrip.use_auto_blend) - [use_auto_ik (bpy.types.Pose attribute)](bpy.types.Pose.html#bpy.types.Pose.use_auto_ik) - [use_auto_keyframe_insert_needed (bpy.types.PreferencesEdit attribute)](bpy.types.PreferencesEdit.html#bpy.types.PreferencesEdit.use_auto_keyframe_insert_needed) - [use_auto_keying (bpy.types.MovieTrackingPlaneTrack attribute)](bpy.types.MovieTrackingPlaneTrack.html#bpy.types.MovieTrackingPlaneTrack.use_auto_keying)   - [(bpy.types.PreferencesEdit attribute)](bpy.types.PreferencesEdit.html#bpy.types.PreferencesEdit.use_auto_keying) - [use_auto_keying_warning (bpy.types.PreferencesEdit attribute)](bpy.types.PreferencesEdit.html#bpy.types.PreferencesEdit.use_auto_keying_warning) - [use_auto_lock_translation_axis (bpy.types.SpaceGraphEditor attribute)](bpy.types.SpaceGraphEditor.html#bpy.types.SpaceGraphEditor.use_auto_lock_translation_axis) - [use_auto_merge_keyframes (bpy.types.SpaceDopeSheetEditor attribute)](bpy.types.SpaceDopeSheetEditor.html#bpy.types.SpaceDopeSheetEditor.use_auto_merge_keyframes)   - [(bpy.types.SpaceGraphEditor attribute)](bpy.types.SpaceGraphEditor.html#bpy.types.SpaceGraphEditor.use_auto_merge_keyframes) - [use_auto_normalization (bpy.types.SpaceGraphEditor attribute)](bpy.types.SpaceGraphEditor.html#bpy.types.SpaceGraphEditor.use_auto_normalization) - [use_auto_normalize (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.use_auto_normalize) - [use_auto_perspective (bpy.types.PreferencesInput attribute)](bpy.types.PreferencesInput.html#bpy.types.PreferencesInput.use_auto_perspective) - [use_auto_refresh (bpy.types.CompositorNodeCryptomatteV2 attribute)](bpy.types.CompositorNodeCryptomatteV2.html#bpy.types.CompositorNodeCryptomatteV2.use_auto_refresh)   - [(bpy.types.CompositorNodeImage attribute)](bpy.types.CompositorNodeImage.html#bpy.types.CompositorNodeImage.use_auto_refresh)   - [(bpy.types.ImageUser attribute)](bpy.types.ImageUser.html#bpy.types.ImageUser.use_auto_refresh) - [use_auto_remove_fill_guides (bpy.types.BrushGpencilSettings attribute)](bpy.types.BrushGpencilSettings.html#bpy.types.BrushGpencilSettings.use_auto_remove_fill_guides) - [use_auto_save_temporary_files (bpy.types.PreferencesFilePaths attribute)](bpy.types.PreferencesFilePaths.html#bpy.types.PreferencesFilePaths.use_auto_save_temporary_files) - [use_auto_step (bpy.types.Itasc attribute)](bpy.types.Itasc.html#bpy.types.Itasc.use_auto_step)   - [(bpy.types.SoftBodySettings attribute)](bpy.types.SoftBodySettings.html#bpy.types.SoftBodySettings.use_auto_step) - [use_auto_texspace (bpy.types.Curve attribute)](bpy.types.Curve.html#bpy.types.Curve.use_auto_texspace)   - [(bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.use_auto_texspace)   - [(bpy.types.MetaBall attribute)](bpy.types.MetaBall.html#bpy.types.MetaBall.use_auto_texspace) - [use_auto_update (bpy.types.ShaderNodeScript attribute)](bpy.types.ShaderNodeScript.html#bpy.types.ShaderNodeScript.use_auto_update) - [use_auto_velocity (bpy.types.ParticleEdit attribute)](bpy.types.ParticleEdit.html#bpy.types.ParticleEdit.use_auto_velocity) - [use_autolock_layers (bpy.types.GreasePencil attribute)](bpy.types.GreasePencil.html#bpy.types.GreasePencil.use_autolock_layers) - [use_automasking_boundary_edges (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_boundary_edges)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_boundary_edges) - [use_automasking_boundary_face_sets (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_boundary_face_sets)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_boundary_face_sets) - [use_automasking_cavity (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_cavity)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_cavity) - [use_automasking_cavity_inverted (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_cavity_inverted)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_cavity_inverted) - [use_automasking_custom_cavity_curve (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_custom_cavity_curve)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_custom_cavity_curve) - [use_automasking_face_sets (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_face_sets)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_face_sets) - [use_automasking_layer_active (bpy.types.GPencilSculptSettings attribute)](bpy.types.GPencilSculptSettings.html#bpy.types.GPencilSculptSettings.use_automasking_layer_active) - [use_automasking_layer_stroke (bpy.types.GPencilSculptSettings attribute)](bpy.types.GPencilSculptSettings.html#bpy.types.GPencilSculptSettings.use_automasking_layer_stroke) - [use_automasking_material_active (bpy.types.GPencilSculptSettings attribute)](bpy.types.GPencilSculptSettings.html#bpy.types.GPencilSculptSettings.use_automasking_material_active) - [use_automasking_material_stroke (bpy.types.GPencilSculptSettings attribute)](bpy.types.GPencilSculptSettings.html#bpy.types.GPencilSculptSettings.use_automasking_material_stroke) - [use_automasking_start_normal (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_start_normal)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_start_normal) - [use_automasking_stroke (bpy.types.GPencilSculptSettings attribute)](bpy.types.GPencilSculptSettings.html#bpy.types.GPencilSculptSettings.use_automasking_stroke) - [use_automasking_topology (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_topology)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_topology) - [use_automasking_view_normal (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_view_normal)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_view_normal) - [use_automasking_view_occlusion (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_automasking_view_occlusion)   - [(bpy.types.Sculpt attribute)](bpy.types.Sculpt.html#bpy.types.Sculpt.use_automasking_view_occlusion) - [use_automatic_name (bpy.types.BakeSettings attribute)](bpy.types.BakeSettings.html#bpy.types.BakeSettings.use_automatic_name) - [use_autopack (bpy.types.BlendData attribute)](bpy.types.BlendData.html#bpy.types.BlendData.use_autopack) - [use_autoscale (bpy.types.MovieTrackingStabilization attribute)](bpy.types.MovieTrackingStabilization.html#bpy.types.MovieTrackingStabilization.use_autoscale) - [use_autosplit (bpy.types.FFmpegSettings attribute)](bpy.types.FFmpegSettings.html#bpy.types.FFmpegSettings.use_autosplit) - [use_avoid (bpy.types.BoidRuleAvoidCollision attribute)](bpy.types.BoidRuleAvoidCollision.html#bpy.types.BoidRuleAvoidCollision.use_avoid) - [use_avoid_collision (bpy.types.BoidRuleAvoidCollision attribute)](bpy.types.BoidRuleAvoidCollision.html#bpy.types.BoidRuleAvoidCollision.use_avoid_collision) - [use_axis (bpy.types.MirrorModifier attribute)](bpy.types.MirrorModifier.html#bpy.types.MirrorModifier.use_axis) - [use_axis_x (bpy.types.GreasePencilMirrorModifier attribute)](bpy.types.GreasePencilMirrorModifier.html#bpy.types.GreasePencilMirrorModifier.use_axis_x) - [use_axis_y (bpy.types.GreasePencilMirrorModifier attribute)](bpy.types.GreasePencilMirrorModifier.html#bpy.types.GreasePencilMirrorModifier.use_axis_y) - [use_axis_z (bpy.types.GreasePencilMirrorModifier attribute)](bpy.types.GreasePencilMirrorModifier.html#bpy.types.GreasePencilMirrorModifier.use_axis_z) - [use_back_face_culling (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_back_face_culling) - [use_backface_culling (bpy.types.ImagePaint attribute)](bpy.types.ImagePaint.html#bpy.types.ImagePaint.use_backface_culling)   - [(bpy.types.Material attribute)](bpy.types.Material.html#bpy.types.Material.use_backface_culling) - [use_backface_culling_lightprobe_volume (bpy.types.Material attribute)](bpy.types.Material.html#bpy.types.Material.use_backface_culling_lightprobe_volume) - [use_backface_culling_shadow (bpy.types.Material attribute)](bpy.types.Material.html#bpy.types.Material.use_backface_culling_shadow) - [use_bbone_shape (bpy.types.CopyLocationConstraint attribute)](bpy.types.CopyLocationConstraint.html#bpy.types.CopyLocationConstraint.use_bbone_shape)   - [(bpy.types.CopyTransformsConstraint attribute)](bpy.types.CopyTransformsConstraint.html#bpy.types.CopyTransformsConstraint.use_bbone_shape)   - [(bpy.types.DampedTrackConstraint attribute)](bpy.types.DampedTrackConstraint.html#bpy.types.DampedTrackConstraint.use_bbone_shape)   - [(bpy.types.LimitDistanceConstraint attribute)](bpy.types.LimitDistanceConstraint.html#bpy.types.LimitDistanceConstraint.use_bbone_shape)   - [(bpy.types.LockedTrackConstraint attribute)](bpy.types.LockedTrackConstraint.html#bpy.types.LockedTrackConstraint.use_bbone_shape)   - [(bpy.types.PivotConstraint attribute)](bpy.types.PivotConstraint.html#bpy.types.PivotConstraint.use_bbone_shape)   - [(bpy.types.StretchToConstraint attribute)](bpy.types.StretchToConstraint.html#bpy.types.StretchToConstraint.use_bbone_shape)   - [(bpy.types.TrackToConstraint attribute)](bpy.types.TrackToConstraint.html#bpy.types.TrackToConstraint.use_bbone_shape) - [use_bezier_u (bpy.types.Spline attribute)](bpy.types.Spline.html#bpy.types.Spline.use_bezier_u) - [use_bezier_v (bpy.types.Spline attribute)](bpy.types.Spline.html#bpy.types.Spline.use_bezier_v) - [use_bisect_axis (bpy.types.MirrorModifier attribute)](bpy.types.MirrorModifier.html#bpy.types.MirrorModifier.use_bisect_axis) - [use_bisect_flip_axis (bpy.types.MirrorModifier attribute)](bpy.types.MirrorModifier.html#bpy.types.MirrorModifier.use_bisect_flip_axis) - [use_blue_channel (bpy.types.MovieTrackingTrack attribute)](bpy.types.MovieTrackingTrack.html#bpy.types.MovieTrackingTrack.use_blue_channel) - [use_bokeh_jittered (bpy.types.SceneEEVEE attribute)](bpy.types.SceneEEVEE.html#bpy.types.SceneEEVEE.use_bokeh_jittered) - [use_bold (bpy.types.TextCharacterFormat attribute)](bpy.types.TextCharacterFormat.html#bpy.types.TextCharacterFormat.use_bold)   - [(bpy.types.TextStrip attribute)](bpy.types.TextStrip.html#bpy.types.TextStrip.use_bold) - [use_bone_envelopes (bpy.types.ArmatureConstraint attribute)](bpy.types.ArmatureConstraint.html#bpy.types.ArmatureConstraint.use_bone_envelopes)   - [(bpy.types.ArmatureModifier attribute)](bpy.types.ArmatureModifier.html#bpy.types.ArmatureModifier.use_bone_envelopes)   - [(bpy.types.GreasePencilArmatureModifier attribute)](bpy.types.GreasePencilArmatureModifier.html#bpy.types.GreasePencilArmatureModifier.use_bone_envelopes) - [use_bone_object_action (bpy.types.ActionConstraint attribute)](bpy.types.ActionConstraint.html#bpy.types.ActionConstraint.use_bone_object_action) - [use_border (bpy.types.RenderSettings attribute)](bpy.types.RenderSettings.html#bpy.types.RenderSettings.use_border) - [use_bou