Memo abbr (4)

I think it could be either:

asap

attn

(Other definitions for asap that I've seen before include "yesterday?" , "Notation meaning without delay, fast as you can" , "Notation or acronym meaning without avoidable delay" , "At one's earliest convenience" , "Notation meaning with minimum delay" .)

I've seen this clue in The Washington Post, the LA Times, the Wall Street Journal, the L.A. Times Daily, the Universal and the New York Times.

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