Assistant principal, the assistant chief administrator in a school

arterial pressure

Action potential, a "spike" of electrical discharge that travels along the membrane of a cell

Andhra Pradesh, a state in southern India

Airforce Publication, a document written by the Royal Air Force describing various parts of its structure

Attack power, in various MMORPGs

Ang Pamantasan, the official student paper of Pamantasan ng Lungsod ng Maynila

ap, a Welsh patronym

Arunachal Pradesh, a state in north-eastern India

AP, the U.S. Navy hull classification symbol for transport support ships

AP Poll

A&P, the common name of the Great Atlantic and Pacific Tea Company

AP, the United States postal abbreviation for U.S. military personnel in the Pacific Ocean region

Associated Press, an American news agency

Attachment parenting, a parenting philosophy

Armor-piercing, a type of ammunition designed to penetrate armour and detonate

Acetone peroxide, an explosive

Asia-Pacific, the term for littoral East Asia, South East Asia and Australasia near the Pacific Ocean, plus the states in the ocean itself

Andean Pact, a South American trade agreement

Au pair, a young person living on an equal basis with a host family in a foreign country

Access point, a device that connects wireless communication devices together to form a wireless network

Accounts payable, one of a series of accounting transactions covering payments to suppliers

Arithmetic progression, a sequence of numbers, each differing from its predecessor by a fixed quantity

The IATA code for Air One

Asian pride, a slogan used by people of Asian descent who live outside the continent

Alternative Press, a music magazine

Advanced Placement Program, a program that offers college level courses at high schools across the United States and Canada

Acción Popular, a conservative liberal political party in Peru

Ammonium perchlorate, an oxidizer used in solid rocket propellant

Action point, a point-system used notably in video games

Armenian Power, an Armenian-American gang located in Los Angeles

Aeroklub Polski, the Polish central association of persons practising air sports or recreational flying

Applied physics, physics which is intended for a particular technological or practical use

Ap (water), the Vedic Sanskrit term for water

Allied Press, a major New Zealand newspaper company

A&P (disambiguation)

Area postrema in the brain

Asset protection, private security in retail stores and other places

Abja-Paluoja, Estonia

Anthony Parker, American basketball player who currently plays for the Toronto Raptors of the NBA

Adrian Peterson, American football player who currently plays for the Minnesota Vikings of the NFL

Antonio Pierce. American football player who currently plays for the New York Giants of the NFL