PEN may refer to:* International PEN, the worldwide association of writers Penang International Airport in Penang, Malaysia (IATA airport code) Penarth railway station, Wales; National Rail station code PEN PEN, the ISO 4217 code for Peruvian nuevo sol, the currency of Peru Polyethylene naphthalate, a polymer Private enterprise number, an object identifier in computing Olympus Pen is a series of half-frame cameras made by Olympus from 1959 to the beginning of the 1980s See also: Pen (disambiguat… (More on Pen)