Returns the unit's level.
/script SendChatMessage("Level "..UnitLevel("target"));
If the current target is a Level 50 mob, this macro will print Level 50 in your chat window. If the unit's level is unknown, i.e. a Level ?? target, or is a special boss, UnitLevel() will return -1.
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The functon UnitLevel("player") returns correct results after the PLAYER_ENTERING_WORLD event.
Note that the value returned by UnitLevel("player") will most likely be incorrect when called in a PLAYER_LEVEL_UP event handler, or shortly after leveling in general. Check PLAYER_LEVEL_UP arg1 for the correct level.