| U | XMonad.Util.Types, XMonad.Layout.Gaps, XMonad.Layout.Dwindle, XMonad.Actions.WindowNavigation, XMonad.Actions.MouseGestures, XMonad.Actions.FloatKeys, XMonad.Hooks.ManageDocks, XMonad.Actions.FloatSnap, XMonad.Layout.WindowNavigation, XMonad.Layout.Tabbed, XMonad.Layout.SideBorderDecoration, XMonad.Layout.BinarySpacePartition, XMonad.Actions.Navigation2D | 
| uncons | XMonad.Prelude | 
| uncurry | XMonad.Config.Prime | 
| undefineCursor | XMonad.Config.Prime | 
| undefined | XMonad.Config.Prime | 
| uNDERLINE_POSITION | XMonad.Config.Prime | 
| uNDERLINE_THICKNESS | XMonad.Config.Prime | 
| underMouse | XMonad.Hooks.Place | 
| UnEscape | XMonad.Layout.MessageControl | 
| unEscape | XMonad.Layout.MessageControl | 
| unfocusedFormat | XMonad.Util.Loggers | 
| unfocusedFormatClassname | XMonad.Util.Loggers | 
| unfoldr | XMonad.Prelude | 
| unFullFloat | XMonad.Actions.ToggleFullFloat | 
| unGrab | XMonad.Util.Ungrab, XMonad.Config.Prime | 
| ungrabButton | XMonad.Config.Prime | 
| ungrabKey | XMonad.Config.Prime | 
| ungrabKeyboard | XMonad.Config.Prime | 
| ungrabKP | XMonad.Util.Grab | 
| ungrabPointer | XMonad.Config.Prime | 
| ungrabServer | XMonad.Config.Prime | 
| unhook | XMonad.Layout.LayoutModifier, XMonad.Layout.Decoration | 
| unicodePrompt | XMonad.Prompt.Unicode | 
| uninstallColormap | XMonad.Config.Prime | 
| uninstallSignalHandlers | XMonad.Config.Prime | 
| Union | XMonad.Layout.NoBorders | 
| union | XMonad.Prelude | 
| unionBy | XMonad.Prelude | 
| unionRectWithRegion | XMonad.Config.Prime | 
| unionRegion | XMonad.Config.Prime | 
| uniqSort | XMonad.Prompt | 
| unless | XMonad.Prelude | 
| unlessFocusLock | XMonad.Hooks.Focus | 
| unlines | XMonad.Prelude, XMonad.Config.Prime | 
| unlockDisplay | XMonad.Config.Prime | 
| unmanage | XMonad.Config.Prime | 
| UnmapEvent | XMonad.Config.Prime | 
| unmapGravity | XMonad.Config.Prime | 
| unmapNotify | XMonad.Config.Prime | 
| unmappedWindowRect | XMonad.Actions.Navigation2D | 
| unmapSubwindows | XMonad.Config.Prime | 
| unmapWindow | XMonad.Config.Prime | 
| unmarshall | XMonad.Layout.IndependentScreens | 
| unmarshallS | XMonad.Layout.IndependentScreens | 
| unmarshallW | XMonad.Layout.IndependentScreens | 
| unmarshallWindowSpace | XMonad.Layout.IndependentScreens | 
| unMatch | XMonad.Actions.LinkWorkspaces | 
| UnMerge | XMonad.Layout.SubLayouts | 
| UnMergeAll | XMonad.Layout.SubLayouts | 
| unName | XMonad.Util.NamedWindows | 
| unsafePrompt | XMonad.Prompt.Shell | 
| unsafeSpawn | XMonad.Util.Run | 
| unsnoc | XMonad.Prelude | 
| unTag | XMonad.Actions.TagWindows | 
| until | XMonad.Config.Prime | 
| unwords | XMonad.Prelude, XMonad.Config.Prime | 
| unwrapArrow | XMonad.Prelude | 
| unwrapMonad | XMonad.Prelude | 
| unzip | XMonad.Prelude, XMonad.Config.Prime | 
| unzip3 | XMonad.Prelude, XMonad.Config.Prime | 
| unzip4 | XMonad.Prelude | 
| unzip5 | XMonad.Prelude | 
| unzip6 | XMonad.Prelude | 
| unzip7 | XMonad.Prelude | 
| UpdateableClass | XMonad.Config.Prime | 
| UpdateBoring |   | 
| 1 (Type/Class) | XMonad.Layout.BoringWindows | 
| 2 (Data Constructor) | XMonad.Layout.BoringWindows | 
| updateDynamicHook | XMonad.Hooks.DynamicHooks | 
| updateLayout | XMonad.Config.Prime | 
| updateMasterHistory | XMonad.Actions.SwapPromote | 
| updateName | XMonad.Actions.DynamicWorkspaceOrder | 
| updatePointer | XMonad.Actions.UpdatePointer | 
| updateRecentsOn | XMonad.Hooks.RefocusLast | 
| UppercaseLetter | XMonad.Prelude | 
| UpperLeft | XMonad.Actions.Warp | 
| UpperRight | XMonad.Actions.Warp | 
| urgencyBorderColor | XMonad.Hooks.UrgencyHook | 
| UrgencyConfig |   | 
| 1 (Type/Class) | XMonad.Hooks.UrgencyHook | 
| 2 (Data Constructor) | XMonad.Hooks.UrgencyHook | 
| urgencyConfig | XMonad.Hooks.UrgencyHook | 
| urgencyHintBit | XMonad.Config.Prime | 
| UrgencyHook | XMonad.Hooks.UrgencyHook | 
| urgencyHook | XMonad.Hooks.UrgencyHook | 
| urgentBorderColor | XMonad.Layout.Decoration, XMonad.Layout.Tabbed, XMonad.Layout.SimpleDecoration, XMonad.Layout.NoFrillsDecoration, XMonad.Layout.DwmStyle | 
| urgentBorderWidth | XMonad.Layout.Decoration, XMonad.Layout.Tabbed, XMonad.Layout.SimpleDecoration, XMonad.Layout.NoFrillsDecoration, XMonad.Layout.DwmStyle | 
| urgentColor | XMonad.Layout.Decoration, XMonad.Layout.Tabbed, XMonad.Layout.SimpleDecoration, XMonad.Layout.NoFrillsDecoration, XMonad.Layout.DwmStyle | 
| urgentFormat | XMonad.Util.Loggers | 
| urgentFormatClassname | XMonad.Util.Loggers | 
| urgentTextColor | XMonad.Layout.Decoration, XMonad.Layout.Tabbed, XMonad.Layout.SimpleDecoration, XMonad.Layout.NoFrillsDecoration, XMonad.Layout.DwmStyle | 
| UrgentWindow | XMonad.Layout.DecorationEx.Common | 
| use | XMonad.Actions.Search | 
| useDefaultPrefixArgument | XMonad.Actions.Prefix | 
| usePrefixArgument | XMonad.Actions.Prefix | 
| userCode | XMonad.Config.Prime | 
| userCodeDef | XMonad.Config.Prime | 
| userError | XMonad.Config.Prime | 
| UseTransientFor | XMonad.Layout.TrackFloating | 
| useTransientFor | XMonad.Layout.TrackFloating | 
| Utf8 | XMonad.Util.Font |