DKP
From Twilight Wiki
Dragon kill points (usually abbreviated with the acronym DKP) designates a kind of currency which is earned by participating in endgame raids and spent by acquiring loot from endgame bosses. The term DKP is also frequently used to designate raid-level loot system in general. The most popular systems for endgame loot distribution are point-based (and thus DKP systems). The very first endgame loot distribution system was developed by the guild Afterlife in 1999 and named for the original two EverQuest end bosses, both of whom were dragons.
What is DKP?
DKP, short for Dragon Kill Points, is a concept originally created by Thott of Afterlife, at a time where the only two raid targets in Everquest were two dragons, Lady Vox and Lord Nagafen. These points are awarded to each guild member as they attend a guild raid. The current DKP of each member reflects his or her priority for loot. When a member "wins" an item, they lose a DKP amount that reflects the value of that item.
DKP allows for an unbiased comparison between guild members when decisions about loot are to be made based on attendance and recent items that have been awarded.