Bp stars Military engineering Anomalous propagation, or false radar echoes Armor-piercing, a type of ammunition Transport support ship (U.S. Navy hull classification symbol: AP) A&P mechanic, an aircraft maintenance technician with Airframe and Powerplant ratings Other uses Arthur Paul Harper (1865–1955), New Zealand lawyer, mountaineer, explorer, businessman known as AP , a Welsh patronymic ap. a classical abbreviation Adjective phrase a/p is an abbreviation used in Autopilot See also Several abbreviations in list of medical abbreviations: A The Great Atlantic & Pacific Tea Company (disambiguation) APP (disambiguation) APS (disambiguation)