Initialism of postage, processing and handling.

plural of ppl

plural of PPE

(physics) proton and antiproton (used attributively to describe a collision or other interaction of these two particles)

(archaeology) Pre-Pottery Neolithic B

(sciences) parts per billion by volume

Synonym of trot (“Korean pop music genre”)

(computing, initialism) Personal Package Archive (software repository for managing source packages in Ubuntu)

(aviation, travel) Positive Passenger Bag Match. An airline system used to ensure that baggage is not loaded on an aircraft if the passenger does not board.

plural of PPL