Short for "Do you want your possessions identified?" This is the notorious prompt that immediately follows a character's death in Nethack. Believe it or not, this can be even more frustrating, inspiring worse pit of the stomach feelings than the simple "You die... --More--", in those situations when one thought (s)he was safely under the protection of an Amulet of Life Saving, and so expected "But wait! Your medallion begins to glow!"

This abbreviation is commonly seen in YASD posts on For the record, I have twice made the above AoLS mistake (wearing an Amulet of Magical Breathing instead, IIRC) in the endgame, so I know how it feels.