Index - U
| uncurry | Ki.Internal |
| undefined | Ki.Internal |
| uninterruptibleMask | Ki.Internal |
| uniqueInt | Ki.Internal |
| unless | Ki.Internal |
| unlines | Ki.Internal |
| unsafeUnmask | Ki.Internal |
| until | Ki.Internal |
| unwords | Ki.Internal |
| unzip | Ki.Internal |
| unzip3 | Ki.Internal |
| userError | Ki.Internal |