- (POSS) The National Geographic Society – Palomar Observatory Sky Survey (NGS-POSS) is a major photographic survey of the night sky that was completed at Palomar Observatory in 1958.
- (Poss (basketball)) Poss is a stat used to estimate the number of offensive possessions a player is accountable for. It was developed by Dean Oliver, the first full-time statistical analyst in the NBA.
- (poss) To mix with a vertical motion, especially when hand washing; Alternative form of poss.
- (POSS) persistent object storage system; proximal over-shoulder strap
- (POSS) possessive, that is, [B], PO towards whatever is being referenced