PU Guinea-Bissau's (NATO country code)

Pu - the chemical sign for Plutonium

mainframe processor units (PUs), see IBM mainframe.

PU, the IATA airline designator for PLUNA

"PU", a spelling of the sound "peeyoo!", a common verbal response to the smell of something unpleasant. See P.U. for its use in cartoon movies.

Pickup (music), a part of an electric instrument which detects vibrations from a string.