| TAttribute | Diagrams.Core.Style |
| tAttrToStyle | Diagrams.Core.Style |
| toDTree | Diagrams.Core.Compile |
| toName | Diagrams.Core.Names, Diagrams.Core |
| toRTree | Diagrams.Core.Compile |
| Trace | |
| 1 (Type/Class) | Diagrams.Core.Trace, Diagrams.Core |
| 2 (Data Constructor) | Diagrams.Core.Trace, Diagrams.Core |
| trace | Diagrams.Core.Types, Diagrams.Core |
| Traced | Diagrams.Core.Trace, Diagrams.Core |
| traceP | Diagrams.Core.Trace, Diagrams.Core |
| traceV | Diagrams.Core.Trace, Diagrams.Core |
| transfFromAnnot | Diagrams.Core.Types |
| transform | Diagrams.Core.Transform, Diagrams.Core |
| Transformable | Diagrams.Core.Transform, Diagrams.Core |
| Transformation | |
| 1 (Type/Class) | Diagrams.Core.Transform, Diagrams.Core |
| 2 (Data Constructor) | Diagrams.Core.Transform |
| transformWithFreeze | Diagrams.Core.Types, Diagrams.Core |
| transfToAnnot | Diagrams.Core.Types |
| TransInv | |
| 1 (Type/Class) | Diagrams.Core.Transform, Diagrams.Core |
| 2 (Data Constructor) | Diagrams.Core.Transform, Diagrams.Core |
| transl | Diagrams.Core.Transform, Diagrams.Core |
| translate | Diagrams.Core.Transform, Diagrams.Core |
| translation | Diagrams.Core.Transform, Diagrams.Core |
| transp | Diagrams.Core.Transform, Diagrams.Core |