The source of these symbols is XF86keysym.h in the Xorg source code.
XF86AddFavorite XF86ApplicationLeft XF86ApplicationRight XF86AudioMedia XF86AudioMute XF86AudioNext XF86AudioPause XF86AudioPlay XF86AudioPrev XF86AudioLowerVolume XF86AudioRaiseVolume XF86AudioRecord XF86AudioRewind XF86AudioStop XF86Away XF86Back XF86Book XF86BrightnessAdjust XF86CD XF86Calculator XF86Calendar XF86Clear XF86ClearGrab XF86Close XF86Community XF86ContrastAdjust XF86Copy XF86Cut XF86DOS XF86Display XF86Documents XF86Eject XF86Excel XF86Explorer XF86Favorites XF86Finance XF86Forward XF86Game XF86Go XF86History XF86HomePage XF86HotLinks XF86Launch0 XF86Launch1 XF86Launch2 XF86Launch3 XF86Launch4 XF86Launch5 XF86Launch6 XF86Launch7 XF86Launch8 XF86Launch9 XF86LaunchA XF86LaunchB XF86LaunchC XF86LaunchD XF86LaunchE XF86LaunchF XF86LightBulb XF86LogOff XF86Mail XF86MailForward XF86Market XF86Meeting XF86Memo XF86MenuKB XF86MenuPB XF86Messenger XF86MonBrightnessUp XF86MonBrightnessDown XF86Music XF86MyComputer XF86MySites XF86New XF86News XF86Next_VMode XF86Prev_VMode XF86OfficeHome XF86Open XF86OpenURL XF86Option XF86Paste XF86Phone XF86Pictures XF86PowerDown XF86PowerOff XF86Next_VMode XF86Prev_VMode XF86Q XF86Refresh XF86Reload XF86Reply XF86RockerDown XF86RockerEnter XF86RockerUp XF86RotateWindows XF86RotationKB XF86RotationPB XF86Save XF86ScreenSaver XF86ScrollClick XF86ScrollDown XF86ScrollUp XF86Search XF86Send XF86Shop XF86Sleep XF86Spell XF86SplitScreen XF86Standby XF86Start XF86Stop XF86Support XF86Switch_VT_1 XF86Switch_VT_10 XF86Switch_VT_11 XF86Switch_VT_12 XF86Switch_VT_2 XF86Switch_VT_3 XF86Switch_VT_4 XF86Switch_VT_5 XF86Switch_VT_6 XF86Switch_VT_7 XF86Switch_VT_8 XF86Switch_VT_9 XF86TaskPane XF86Terminal XF86ToDoList XF86Tools XF86Travel XF86Ungrab XF86User1KB XF86User2KB XF86UserPB XF86VendorHome XF86Video XF86WWW XF86WakeUp XF86WebCam XF86WheelButton XF86Word XF86XF86BackForward XF86Xfer XF86ZoomIn XF86ZoomOut XF86iTouch