Index - T
| tan | Prelude |
| Text | Prelude, Core |
| TextEntry | Prelude |
| textHash | Extras.Util |
| TextStyle | Prelude |
| thickArc | Prelude |
| thickCircle | Prelude |
| thickClosedCurve | Prelude |
| thickCurve | Prelude |
| thickPolygon | Prelude |
| thickPolyline | Prelude |
| thickPolylines | Extras.Turtle |
| thickRectangle | Prelude |
| TimePassing | Prelude |
| timer | |
| 1 (Function) | Parameter |
| 2 (Function) | Extras.Widget |
| toDouble | Prelude |
| toggle | |
| 1 (Function) | Parameter |
| 2 (Function) | Extras.Widget |
| toInt | Prelude |
| toOperator | Prelude |
| toString | Prelude |
| traced | Prelude |
| Track | Extras.Turtle |
| track | Extras.Turtle |
| trackLength | Extras.Turtle |
| tracks | Extras.Turtle |
| translated | Prelude |
| translatedPoint | Prelude |
| translucent | Prelude |
| transposed | Prelude |
| Tree | Extras.Cw |
| tree | Extras.Cw |
| treeDepth | Extras.Cw |
| treeWidth | Extras.Cw |
| True | Prelude, Core |
| truncation | Prelude |
| Truth | Prelude, Core |
| Turtle | Extras.Turtle |
| turtle | Extras.Turtle |
| turtleAngle | Extras.Turtle |
| TurtleCommand | Extras.Turtle |
| turtleExamples | Extras.Turtle |
| turtlePosition | Extras.Turtle |
| TurtleProgram | Extras.Turtle |