Ok so this 'might' not actually be a Bat'Leth but it is pretty freakin cool regardless. Type Bat'Leth into GOOGLE and these do come up, and GOOGLE is never wrong, right? Bat'Leth or Glaive (?) or just an awesome sharp spiky thing with lots of points and whether it be from Star Trek of World of Warcraft or summit else completely this is a really nice unique piece to add to your collection.
Shadowmourne is a legendary two-handed axe which is a quest reward from Neutral 15. It is available exclusively to warriors, paladins, and death knights.
More to the point, this is a freakin' cool looking axe wot should be on your wall. Seriously this thing is MASSIVE, and detailed and did I mention just how COOL this thing is? It has two skull thingies so that's gotta be good right? And a blade with sticky out bits to catch someones soft bits and do untold damage to them - nice!