An axe (aka ax) is a one-handed or two-handed, edged weapon usually constructed of a short, broad blade attached to a short pole. The form of the blade varies widely, but the pole is never very long.
Both one-handed and two handed axes can be wielded by Death Knights, Hunters, Paladins, Shaman, and Warriors.
The orc race has both the One- Handed Axe and Two-Handed Axe specializations, which now gives 5 additional Expertise points with these weapons.
The list of trainers can be found here: Weapons Trainers.
A few notable two-handed axes (pre-Burning Crusade):
- [Dark Edge of Insanity]
- [Draconic Avenger]
- [Arcanite Reaper]
A few notable one-handed axes (pre-Burning Crusade):
- [Blessed Qiraji War Axe]
- [Ancient Hakkari Manslayer]
- [Hatchet of Sundered Bone]