Index - U
| Unassoc | Predicate |
| Uncons | Predicate |
| Unfoldr | Predicate |
| UnfoldT | Predicate |
| Ungreedy | UtilP, Predicate |
| unHolder | UtilP, Predicate |
| Unicode | UtilP, Predicate |
| unicode | UtilP, Predicate |
| UnMkDay | Predicate |
| unPColor | UtilP, Predicate |
| Unproxy | Predicate |
| unRavelT | Refined |
| unRavelTI | Refined |
| unRavelTIO | Refined |
| unRefined | Refined |
| unRefinedT | Refined |
| unsafeRefined | Refined |
| unsafeRefined' | Refined |
| unsafeRefined3 | Refined3 |
| unsafeRefined3' | Refined3 |
| Unsnoc | Predicate |
| Unwrap | Predicate |
| Unzip | Predicate |
| Utf8 | UtilP, Predicate |