Initialism of part number (a unique, manufacturer-assigned identifier of an item or part).

(euphemistic) Any taboo word starting with p, e.g. piss, penis, pussy, prick, pajeet, or Paki. / (phonology) prosodic word, phonological word.

Initialism of Procter & Gamble.

(physics) (Of a semiconductor) in which conduction is due to the movement of positive holes rather than electrons.

Any of the water soluble bioflavonoids that promotes the resistance of capillaries to permeation. / (slang, euphemistic) Prozac, an antidepressant.

Alternative form of p.m.

(geology, seismology) A longitudinal compressional wave produced by an earthquake.

(banking, business) Abbreviation of documents against payment, a trade agreement whereby shipping papers are released once the buyer has paid for the draft

(philosophy) Abbreviation of philosophical zombie.

plural of p-zombie