keysym.h and keysymdef.h
/* $XFree86: xc/include/keysym.h,v 1.3 2001/01/17 17:53:12 dawes Exp $ */
/* default keysyms */
#define XK_MISCELLANY
#define XK_XKB_KEYS
#define XK_LATIN1
#define XK_LATIN2
#define XK_LATIN3
#define XK_LATIN4
#define XK_LATIN8
#define XK_LATIN9
#define XK_CAUCASUS
#define XK_GREEK
#define XK_KATAKANA
#define XK_ARABIC
#define XK_CYRILLIC
#define XK_HEBREW
#define XK_THAI
#define XK_KOREAN
#define XK_ARMENIAN
#define XK_GEORGIAN
#define XK_VIETNAMESE
#define XK_CURRENCY
#define XK_MATHEMATICAL
#define XK_BRAILLE
#include <X11/keysymdef.h>
Not really what I'm looking for, but might be interesting any other time ...