(medicine, education) Initialism of anatomy and physiology. / (aviation) Initialism of airframe and powerplant.

Initialism of The Great Atlantic & Pacific Tea Company: an American chain of grocery stores that operated from 1859 to 2015.

(medicine) Initialism of anterior and posterior. / (business) Initialism of advertising and promotional.

Initialism of postage and packing/packaging. / Initialism of policies and procedures.

(role-playing games) pen-and-paper, usually specifically in reference to the term "pen-and-paper role-playing game", an alternate term for a tabletop role-playing game

Alternative form of p&p (“postage and packing”) / (linguistics) Initialism of principles and parameters.

(Oxford University slang) Initialism of Port and Policy.

(grammar) Alternative form of p.p.

(computing theory) The set of all problems that are solvable in polynomial time by a deterministic Turing machine / (law) Initialism of patient. (the subject of proceedings in the Court of Protection)

The ordinal number sixteenth, derived from this letter of the English alphabet, called pee and written in the Latin script.