ps

Postal service

Public service(s)

PlayStation

Packet-switched

Paddle steamer

Power supply

Polystyrene

Initialism of post scriptum, postscriptum, postscript. (initialism written at the end of a text as a footnote)

Metric horsepower

A discipline of alpine skiing, a variant of slalom. A sport where two skiers compete head to head on parallel identical slalom courses.

An instance of the sports discipline, a course, run or competition.

Certain private schools, particularly (initially) any grammar school operated apart from the personal lands of its students or (from the 19th century) the feepaying secondary schools which developed from or were modelled upon them; a British boarding school

A college or university

(formerly Scottish) A publicly funded and administered school; such schools in the context of other countries