| LAltKey | FRP.Helm.Keyboard |
| LCtrlKey | FRP.Helm.Keyboard |
| LeftBracketKey | FRP.Helm.Keyboard |
| LeftKey | FRP.Helm.Keyboard |
| LeftMouse | FRP.Helm.Mouse |
| LeftParenKey | FRP.Helm.Keyboard |
| length | FRP.Helm.Animation |
| LessKey | FRP.Helm.Keyboard |
| lift | FRP.Helm.Signal, FRP.Helm |
| lift2 | FRP.Helm.Signal, FRP.Helm |
| lift3 | FRP.Helm.Signal, FRP.Helm |
| lift4 | FRP.Helm.Signal, FRP.Helm |
| lift5 | FRP.Helm.Signal, FRP.Helm |
| lift6 | FRP.Helm.Signal, FRP.Helm |
| lift7 | FRP.Helm.Signal, FRP.Helm |
| lift8 | FRP.Helm.Signal, FRP.Helm |
| lime | FRP.Helm.Color, FRP.Helm |
| Linear | FRP.Helm.Color, FRP.Helm |
| linear | FRP.Helm.Color, FRP.Helm |
| LineCap | FRP.Helm.Graphics, FRP.Helm |
| lineCap | FRP.Helm.Graphics, FRP.Helm |
| lineColor | FRP.Helm.Graphics, FRP.Helm |
| lineDashing | FRP.Helm.Graphics, FRP.Helm |
| lineDashOffset | FRP.Helm.Graphics, FRP.Helm |
| LineJoin | FRP.Helm.Graphics, FRP.Helm |
| lineJoin | FRP.Helm.Graphics, FRP.Helm |
| LineStyle | |
| 1 (Type/Class) | FRP.Helm.Graphics, FRP.Helm |
| 2 (Data Constructor) | FRP.Helm.Graphics, FRP.Helm |
| lineWidth | FRP.Helm.Graphics, FRP.Helm |
| LKey | FRP.Helm.Keyboard |
| LMetaKey | FRP.Helm.Keyboard |
| LShiftKey | FRP.Helm.Keyboard |
| LSuperKey | FRP.Helm.Keyboard |