Crossword Genius

What a flat "b" palm facing a nearby fellow stands for, in A.S.L (3)

Ross

I believe the answer is:

his

(Other definitions for his that I've seen before include "That man's" , "It belongs to him" , "Belonging to that man" , "Belonging to the male" , "that chap's" .)

I've seen this clue in The New York Times.
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