PLAYER_TITLE_INVISIBLE_NAME is probably not Blz, and it's not a title really, but 41 and above removes your name, it's cool and could be used for stuff (all the stuff I CANT think of ).
Hope this is useful for someone.
PS: The commented stuff is the playerknowntitles value for the corresponding title (which seems out of date)
enum PlayerTitles
{
PLAYER_TITLE_NONE = 0,//0x00000001,
PLAYER_TITLE_PRIVATE = 1,//0x00000002,
PLAYER_TITLE_CORPORAL = 2,//0x00000004,
PLAYER_TITLE_SERGEANT_A = 3,//0x00000008,
PLAYER_TITLE_MASTER_SERGEANT = 4,//0x00000010,
PLAYER_TITLE_SERGEANT_MAJOR = 5,//0x00000020,
PLAYER_TITLE_KNIGHT = 6,//0x00000040,
PLAYER_TITLE_KNIGHT_LIEUTENANT = 7,//0x00000080,
PLAYER_TITLE_KNIGHT_CAPTAIN = 8,//0x00000100,
PLAYER_TITLE_KNIGHT_CHAMPION = 9,//0x00000200,
PLAYER_TITLE_LIEUTENANT_COMMANDER = 10,//0x00000400,
PLAYER_TITLE_COMMANDER = 11,//0x00000800,
PLAYER_TITLE_MARSHAL = 12,//0x00001000,
PLAYER_TITLE_FIELD_MARSHAL = 13,//0x00002000,
PLAYER_TITLE_GRAND_MARSHAL = 14,//0x00004000,
PLAYER_TITLE_SCOUT = 15,//0x00008000,
PLAYER_TITLE_GRUNT = 16,//0x00010000,
PLAYER_TITLE_SERGEANT_H = 17,//0x00020000,
PLAYER_TITLE_SENIOR_SERGEANT = 18,//0x00040000,
PLAYER_TITLE_FIRST_SERGEANT = 19,//0x00080000,
PLAYER_TITLE_STONE_GUARD = 20,//0x00100000,
PLAYER_TITLE_BLOOD_GUARD = 21,//0x00200000,
PLAYER_TITLE_LEGIONNAIRE = 22,//0x00400000,
PLAYER_TITLE_CENTURION = 23,//0x00800000,
PLAYER_TITLE_CHAMPION = 24,//0x01000000,
PLAYER_TITLE_LIEUTENANT_GENERAL = 25,//0x02000000,
PLAYER_TITLE_GENERAL = 26,//0x04000000,
PLAYER_TITLE_WARLORD = 27,//0x08000000,
PLAYER_TITLE_HIGH_WARLORD = 28,//0x10000000,
PLAYER_TITLE_GLADIATOR = 29,//0x20000000,
PLAYER_TITLE_DUELIST = 30,//0x40000000
PLAYER_TITLE_RIVAL = 31,
PLAYER_TITLE_CHALLENGER = 32,
PLAYER_TITLE_SCARAB_LORD = 33,
PLAYER_TITLE_CONQUEROR = 34,
PLAYER_TITLE_JUSTICAR = 35,
PLAYER_TITLE_CHAMPION_NAARU = 36,
PLAYER_TITLE_MERCILESS_GLAD = 37,
PLAYER_TITLE_SHATTERED_SUN = 38,
PLAYER_TITLE_HAND_OF_ADAL = 39,
PLAYER_TITLE_VENGEFUL_GLAD = 40,
PLAYER_TITLE_INVISIBLE_NAME = 41
};