PT, Pt, or pt may stand for:*Capital Cargo International Airlines IATA airline designator Mitochondrial permeability transition, a loss of impermeability of the membranes of mitochondria that occurs under some pathological conditions such as traumatic brain injury Pacific Time zone Palestinian Territories Panorama Tools Pararosaniline-toluidine histological stain. Part time work or study pattern Partido dos Trabalhadores (Worker's Party), a Brazilian political party Parti des travailleurs… (More on Pt)