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

assistant: ierLimits.use_max_y)   - [(bpy.types.LimitLocationConstraint attribute)](bpy.types.LimitLocationConstraint.html#bpy.types.LimitLocationConstraint.use_max_y)   - [(bpy.types.LimitScaleConstraint attribute)](bpy.types.LimitScaleConstraint.html#bpy.types.LimitScaleConstraint.use_max_y) - [use_max_z (bpy.types.LimitLocationConstraint attribute)](bpy.types.LimitLocationConstraint.html#bpy.types.LimitLocationConstraint.use_max_z)   - [(bpy.types.LimitScaleConstraint attribute)](bpy.types.LimitScaleConstraint.html#bpy.types.LimitScaleConstraint.use_max_z) - [use_memory_cache (bpy.types.Sound attribute)](bpy.types.Sound.html#bpy.types.Sound.use_memory_cache) - [use_merge_vertices (bpy.types.ArrayModifier attribute)](bpy.types.ArrayModifier.html#bpy.types.ArrayModifier.use_merge_vertices)   - [(bpy.types.ScrewModifier attribute)](bpy.types.ScrewModifier.html#bpy.types.ScrewModifier.use_merge_vertices) - [use_merge_vertices_cap (bpy.types.ArrayModifier attribute)](bpy.types.ArrayModifier.html#bpy.types.ArrayModifier.use_merge_vertices_cap) - [use_mesh (bpy.types.FluidDomainSettings attribute)](bpy.types.FluidDomainSettings.html#bpy.types.FluidDomainSettings.use_mesh) - [use_mesh_automerge (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.use_mesh_automerge) - [use_mesh_automerge_and_split (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.use_mesh_automerge_and_split) - [use_mesh_mirror_x (bpy.types.Object attribute)](bpy.types.Object.html#bpy.types.Object.use_mesh_mirror_x) - [use_mesh_mirror_y (bpy.types.Object attribute)](bpy.types.Object.html#bpy.types.Object.use_mesh_mirror_y) - [use_mesh_mirror_z (bpy.types.Object attribute)](bpy.types.Object.html#bpy.types.Object.use_mesh_mirror_z) - [use_min (bpy.types.TexMapping attribute)](bpy.types.TexMapping.html#bpy.types.TexMapping.use_min) - [use_min_distance (bpy.types.FieldSettings attribute)](bpy.types.FieldSettings.html#bpy.types.FieldSettings.use_min_distance) - [use_min_x (bpy.types.FModifierLimits attribute)](bpy.types.FModifierLimits.html#bpy.types.FModifierLimits.use_min_x)   - [(bpy.types.LimitLocationConstraint attribute)](bpy.types.LimitLocationConstraint.html#bpy.types.LimitLocationConstraint.use_min_x)   - [(bpy.types.LimitScaleConstraint attribute)](bpy.types.LimitScaleConstraint.html#bpy.types.LimitScaleConstraint.use_min_x) - [use_min_y (bpy.types.FModifierLimits attribute)](bpy.types.FModifierLimits.html#bpy.types.FModifierLimits.use_min_y)   - [(bpy.types.LimitLocationConstraint attribute)](bpy.types.LimitLocationConstraint.html#bpy.types.LimitLocationConstraint.use_min_y)   - [(bpy.types.LimitScaleConstraint attribute)](bpy.types.LimitScaleConstraint.html#bpy.types.LimitScaleConstraint.use_min_y) - [use_min_z (bpy.types.LimitLocationConstraint attribute)](bpy.types.LimitLocationConstraint.html#bpy.types.LimitLocationConstraint.use_min_z)   - [(bpy.types.LimitScaleConstraint attribute)](bpy.types.LimitScaleConstraint.html#bpy.types.LimitScaleConstraint.use_min_z) - [use_mirror_merge (bpy.types.MirrorModifier attribute)](bpy.types.MirrorModifier.html#bpy.types.MirrorModifier.use_mirror_merge) - [use_mirror_relative (bpy.types.Pose attribute)](bpy.types.Pose.html#bpy.types.Pose.use_mirror_relative) - [use_mirror_topology (bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.use_mirror_topology) - [use_mirror_u (bpy.types.MirrorModifier attribute)](bpy.types.MirrorModifier.html#bpy.types.MirrorModifier.use_mirror_u) - [use_mirror_udim (bpy.types.MirrorModifier attribute)](bpy.types.MirrorModifier.html#bpy.types.MirrorModifier.use_mirror_udim) - [use_mirror_v (bpy.types.MirrorModifier attribute)](bpy.types.MirrorModifier.html#bpy.types.MirrorModifier.use_mirror_v) - [use_mirror_vertex_groups (bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.use_mirror_vertex_groups)   - [(bpy.types.MirrorModifier attribute)](bpy.types.MirrorModifier.html#bpy.types.MirrorModifier.use_mirror_vertex_groups) - [use_mirror_x (bpy.types.Armature attribute)](bpy.types.Armature.html#bpy.types.Armature.use_mirror_x)   - [(bpy.types.Curves attribute)](bpy.types.Curves.html#bpy.types.Curves.use_mirror_x)   - [(bpy.types.ImageTexture attribute)](bpy.types.ImageTexture.html#bpy.types.ImageTexture.use_mirror_x)   - [(bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.use_mirror_x)   - [(bpy.types.Pose attribute)](bpy.types.Pose.html#bpy.types.Pose.use_mirror_x) - [use_mirror_y (bpy.types.Curves attribute)](bpy.types.Curves.html#bpy.types.Curves.use_mirror_y)   - [(bpy.types.ImageTexture attribute)](bpy.types.ImageTexture.html#bpy.types.ImageTexture.use_mirror_y)   - [(bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.use_mirror_y) - [use_mirror_z (bpy.types.Curves attribute)](bpy.types.Curves.html#bpy.types.Curves.use_mirror_z)   - [(bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.use_mirror_z) - [use_mist (bpy.types.WorldMistSettings attribute)](bpy.types.WorldMistSettings.html#bpy.types.WorldMistSettings.use_mist) - [use_modifier_stack (bpy.types.ParticleSettings attribute)](bpy.types.ParticleSettings.html#bpy.types.ParticleSettings.use_modifier_stack) - [use_module (bpy.types.Text attribute)](bpy.types.Text.html#bpy.types.Text.use_module) - [use_mono (bpy.types.Sound attribute)](bpy.types.Sound.html#bpy.types.Sound.use_mono) - [use_motion_blur (bpy.types.RenderSettings attribute)](bpy.types.RenderSettings.html#bpy.types.RenderSettings.use_motion_blur)   - [(bpy.types.ViewLayer attribute)](bpy.types.ViewLayer.html#bpy.types.ViewLayer.use_motion_blur) - [use_motion_extrapolate (bpy.types.TransformConstraint attribute)](bpy.types.TransformConstraint.html#bpy.types.TransformConstraint.use_motion_extrapolate) - [use_motor_ang (bpy.types.RigidBodyConstraint attribute)](bpy.types.RigidBodyConstraint.html#bpy.types.RigidBodyConstraint.use_motor_ang) - [use_motor_lin (bpy.types.RigidBodyConstraint attribute)](bpy.types.RigidBodyConstraint.html#bpy.types.RigidBodyConstraint.use_motor_lin) - [use_mouse_continuous (bpy.types.PreferencesInput attribute)](bpy.types.PreferencesInput.html#bpy.types.PreferencesInput.use_mouse_continuous) - [use_mouse_depth_cursor (bpy.types.PreferencesEdit attribute)](bpy.types.PreferencesEdit.html#bpy.types.PreferencesEdit.use_mouse_depth_cursor) - [use_mouse_depth_navigate (bpy.types.PreferencesInput attribute)](bpy.types.PreferencesInput.html#bpy.types.PreferencesInput.use_mouse_depth_navigate) - [use_mouse_emulate_3_button (bpy.types.PreferencesInput attribute)](bpy.types.PreferencesInput.html#bpy.types.PreferencesInput.use_mouse_emulate_3_button) - [use_mouse_over_open (bpy.types.PreferencesView attribute)](bpy.types.PreferencesView.html#bpy.types.PreferencesView.use_mouse_over_open) - [use_mouse_reverse (bpy.types.WalkNavigation attribute)](bpy.types.WalkNavigation.html#bpy.types.WalkNavigation.use_mouse_reverse) - [use_multi_modifier (bpy.types.ArmatureModifier attribute)](bpy.types.ArmatureModifier.html#bpy.types.ArmatureModifier.use_multi_modifier) - [use_multi_word_filter (bpy.types.DopeSheet attribute)](bpy.types.DopeSheet.html#bpy.types.DopeSheet.use_multi_word_filter) - [use_multiframe_falloff (bpy.types.GPencilSculptSettings attribute)](bpy.types.GPencilSculptSettings.html#bpy.types.GPencilSculptSettings.use_multiframe_falloff) - [use_multipaint (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.use_multipaint) - [use_multiplane_scrape_dynamic (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_multiplane_scrape_dynamic) - [use_multiple_levels (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_multiple_levels) - [use_multiple_springs (bpy.types.FieldSettings attribute)](bpy.types.FieldSettings.html#bpy.types.FieldSettings.use_multiple_springs) - [use_multiply (bpy.types.GreasePencilWeightAngleModifier attribute)](bpy.types.GreasePencilWeightAngleModifier.html#bpy.types.GreasePencilWeightAngleModifier.use_multiply)   - [(bpy.types.GreasePencilWeightProximityModifier attribute)](bpy.types.GreasePencilWeightProximityModifier.html#bpy.types.GreasePencilWeightProximityModifier.use_multiply) - [use_multiply_size_mass (bpy.types.ParticleSettings attribute)](bpy.types.ParticleSettings.html#bpy.types.ParticleSettings.use_multiply_size_mass) - [use_multires (bpy.types.BakeSettings attribute)](bpy.types.BakeSettings.html#bpy.types.BakeSettings.use_multires) - [use_multitouch_gestures (bpy.types.PreferencesInput attribute)](bpy.types.PreferencesInput.html#bpy.types.PreferencesInput.use_multitouch_gestures) - [use_multiview (bpy.types.Image attribute)](bpy.types.Image.html#bpy.types.Image.use_multiview)   - [(bpy.types.ImageStrip attribute)](bpy.types.ImageStrip.html#bpy.types.ImageStrip.use_multiview)   - [(bpy.types.MovieStrip attribute)](bpy.types.MovieStrip.html#bpy.types.MovieStrip.use_multiview)   - [(bpy.types.RenderSettings attribute)](bpy.types.RenderSettings.html#bpy.types.RenderSettings.use_multiview) - [use_mute_footage (bpy.types.SpaceClipEditor attribute)](bpy.types.SpaceClipEditor.html#bpy.types.SpaceClipEditor.use_mute_footage) - [use_negative (bpy.types.MetaElement attribute)](bpy.types.MetaElement.html#bpy.types.MetaElement.use_negative) - [use_negative_direction (bpy.types.GreasePencilShrinkwrapModifier attribute)](bpy.types.GreasePencilShrinkwrapModifier.html#bpy.types.GreasePencilShrinkwrapModifier.use_negative_direction)   - [(bpy.types.ShrinkwrapModifier attribute)](bpy.types.ShrinkwrapModifier.html#bpy.types.ShrinkwrapModifier.use_negative_direction) - [use_negative_frames (bpy.types.PreferencesEdit attribute)](bpy.types.PreferencesEdit.html#bpy.types.PreferencesEdit.use_negative_frames) - [use_negative_volume (bpy.types.DynamicPaintBrushSettings attribute)](bpy.types.DynamicPaintBrushSettings.html#bpy.types.DynamicPaintBrushSettings.use_negative_volume) - [use_new_curves_tools (bpy.types.PreferencesExperimental attribute)](bpy.types.PreferencesExperimental.html#bpy.types.PreferencesExperimental.use_new_curves_tools) - [use_nla (bpy.types.AnimData attribute)](bpy.types.AnimData.html#bpy.types.AnimData.use_nla) - [use_nodes (bpy.types.FreestyleLineStyle attribute)](bpy.types.FreestyleLineStyle.html#bpy.types.FreestyleLineStyle.use_nodes)   - [(bpy.types.Light attribute)](bpy.types.Light.html#bpy.types.Light.use_nodes)   - [(bpy.types.Material attribute)](bpy.types.Material.html#bpy.types.Material.use_nodes)   - [(bpy.types.Scene attribute)](bpy.types.Scene.html#bpy.types.Scene.use_nodes)   - [(bpy.types.Texture attribute)](bpy.types.Texture.html#bpy.types.Texture.use_nodes)   - [(bpy.types.World attribute)](bpy.types.World.html#bpy.types.World.use_nodes) - [use_noise (bpy.types.FluidDomainSettings attribute)](bpy.types.FluidDomainSettings.html#bpy.types.FluidDomainSettings.use_noise) - [use_normal (bpy.types.CollisionSettings attribute)](bpy.types.CollisionSettings.html#bpy.types.CollisionSettings.use_normal)   - [(bpy.types.ParticleInstanceModifier attribute)](bpy.types.ParticleInstanceModifier.html#bpy.types.ParticleInstanceModifier.use_normal)   - [(bpy.types.WaveModifier attribute)](bpy.types.WaveModifier.html#bpy.types.WaveModifier.use_normal) - [use_normal_calculate (bpy.types.ScrewModifier attribute)](bpy.types.ScrewModifier.html#bpy.types.ScrewModifier.use_normal_calculate) - [use_normal_falloff (bpy.types.ImagePaint attribute)](bpy.types.ImagePaint.html#bpy.types.ImagePaint.use_normal_falloff) - [use_normal_flip (bpy.types.ScrewModifier attribute)](bpy.types.ScrewModifier.html#bpy.types.ScrewModifier.use_normal_flip) - [use_normal_map (bpy.types.ImageTexture attribute)](bpy.types.ImageTexture.html#bpy.types.ImageTexture.use_normal_map) - [use_normal_x (bpy.types.WaveModifier attribute)](bpy.types.WaveModifier.html#bpy.types.WaveModifier.use_normal_x) - [use_normal_y (bpy.types.WaveModifier attribute)](bpy.types.WaveModifier.html#bpy.types.WaveModifier.use_normal_y) - [use_normal_z (bpy.types.WaveModifier attribute)](bpy.types.WaveModifier.html#bpy.types.WaveModifier.use_normal_z) - [use_normalization (bpy.types.MovieTrackingTrack attribute)](bpy.types.MovieTrackingTrack.html#bpy.types.MovieTrackingTrack.use_normalization)   - [(bpy.types.SpaceGraphEditor attribute)](bpy.types.SpaceGraphEditor.html#bpy.types.SpaceGraphEditor.use_normalization) - [use_normalized (bpy.types.LaplacianSmoothModifier attribute)](bpy.types.LaplacianSmoothModifier.html#bpy.types.LaplacianSmoothModifier.use_normalized) - [use_normals (bpy.types.OceanModifier attribute)](bpy.types.OceanModifier.html#bpy.types.OceanModifier.use_normals) - [use_normals_constant_screen_size (bpy.types.View3DOverlay attribute)](bpy.types.View3DOverlay.html#bpy.types.View3DOverlay.use_normals_constant_screen_size) - [use_numeric_input_advanced (bpy.types.PreferencesInput attribute)](bpy.types.PreferencesInput.html#bpy.types.PreferencesInput.use_numeric_input_advanced) - [use_object (bpy.types.ShaderFxShadow attribute)](bpy.types.ShaderFxShadow.html#bpy.types.ShaderFxShadow.use_object) - [use_object_coords (bpy.types.FieldSettings attribute)](bpy.types.FieldSettings.html#bpy.types.FieldSettings.use_object_coords) - [use_object_instances (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_object_instances) - [use_object_offset (bpy.types.ArrayModifier attribute)](bpy.types.ArrayModifier.html#bpy.types.ArrayModifier.use_object_offset)   - [(bpy.types.GreasePencilArrayModifier attribute)](bpy.types.GreasePencilArrayModifier.html#bpy.types.GreasePencilArrayModifier.use_object_offset) - [use_object_screw_offset (bpy.types.ScrewModifier attribute)](bpy.types.ScrewModifier.html#bpy.types.ScrewModifier.use_object_screw_offset) - [use_object_transform (bpy.types.DataTransferModifier attribute)](bpy.types.DataTransferModifier.html#bpy.types.DataTransferModifier.use_object_transform) - [use_occlude (bpy.types.ImagePaint attribute)](bpy.types.ImagePaint.html#bpy.types.ImagePaint.use_occlude) - [use_occlude_eraser (bpy.types.BrushGpencilSettings attribute)](bpy.types.BrushGpencilSettings.html#bpy.types.BrushGpencilSettings.use_occlude_eraser) - [use_offset (bpy.types.CopyLocationConstraint attribute)](bpy.types.CopyLocationConstraint.html#bpy.types.CopyLocationConstraint.use_offset)   - [(bpy.types.CopyRotationConstraint attribute)](bpy.types.CopyRotationConstraint.html#bpy.types.CopyRotationConstraint.use_offset)   - [(bpy.types.CopyScaleConstraint attribute)](bpy.types.CopyScaleConstraint.html#bpy.types.CopyScaleConstraint.use_offset) - [use_offset_absolute (bpy.types.CurvePaintSettings attribute)](bpy.types.CurvePaintSettings.html#bpy.types.CurvePaintSettings.use_offset_absolute) - [use_offset_pressure (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_offset_pressure) - [use_offset_towards_custom_camera (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_offset_towards_custom_camera) - [use_on_land (bpy.types.BoidRule attribute)](bpy.types.BoidRule.html#bpy.types.BoidRule.use_on_land) - [use_onion_fade (bpy.types.GreasePencil attribute)](bpy.types.GreasePencil.html#bpy.types.GreasePencil.use_onion_fade) - [use_onion_loop (bpy.types.GreasePencil attribute)](bpy.types.GreasePencil.html#bpy.types.GreasePencil.use_onion_loop) - [use_onion_skinning (bpy.types.GreasePencilTreeNode attribute)](bpy.types.GreasePencilTreeNode.html#bpy.types.GreasePencilTreeNode.use_onion_skinning) - [use_online_access (bpy.types.PreferencesSystem attribute)](bpy.types.PreferencesSystem.html#bpy.types.PreferencesSystem.use_online_access) - [use_online_access_handled (bpy.types.PreferencesExtensions attribute)](bpy.types.PreferencesExtensions.html#bpy.types.PreferencesExtensions.use_online_access_handled) - [use_only_boost (bpy.types.GlowStrip attribute)](bpy.types.GlowStrip.html#bpy.types.GlowStrip.use_only_boost) - [use_only_selected_keyframe_handles (bpy.types.SpaceGraphEditor attribute)](bpy.types.SpaceGraphEditor.html#bpy.types.SpaceGraphEditor.use_only_selected_keyframe_handles) - [use_only_smooth (bpy.types.CorrectiveSmoothModifier attribute)](bpy.types.CorrectiveSmoothModifier.html#bpy.types.CorrectiveSmoothModifier.use_only_smooth) - [use_operator_tool_properties (bpy.types.Gizmo attribute)](bpy.types.Gizmo.html#bpy.types.Gizmo.use_operator_tool_properties) - [use_original_normal (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_original_normal) - [use_original_plane (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_original_plane) - [use_original_scale (bpy.types.SplineIKConstraint attribute)](bpy.types.SplineIKConstraint.html#bpy.types.SplineIKConstraint.use_original_scale) - [use_outline (bpy.types.TextStrip attribute)](bpy.types.TextStrip.html#bpy.types.TextStrip.use_outline) - [use_output_a (bpy.types.DynamicPaintSurface attribute)](bpy.types.DynamicPaintSurface.html#bpy.types.DynamicPaintSurface.use_output_a) - [use_output_b (bpy.types.DynamicPaintSurface attribute)](bpy.types.DynamicPaintSurface.html#bpy.types.DynamicPaintSurface.use_output_b) - [use_output_vertex_group_match_by_name (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_output_vertex_group_match_by_name) - [use_outside (bpy.types.Lattice attribute)](bpy.types.Lattice.html#bpy.types.Lattice.use_outside) - [use_overlap_edge_type_support (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_overlap_edge_type_support) - [use_overlap_strokes (bpy.types.MaterialGPencilStyle attribute)](bpy.types.MaterialGPencilStyle.html#bpy.types.MaterialGPencilStyle.use_overlap_strokes) - [use_overlay_frame_lock (bpy.types.SequenceEditor attribute)](bp