"AP trinket" refers to using
Arcane Power (spell acquired from a 31 point talent in the Arcane tree) in conjunction with a trinket's "On Use" ability to further boost your +Spell Damage temporarily.
For example...
Vengeance of the Illidari Binds when picked up
Unique
Trinket
Equip: Improves spell critical strike rating by 26.
Use: Increases spell damage done by up to 120 and healing done by up to 220 for 15 sec.
Edited, Apr 30th 2007 6:44pm by echou