Refers to Gibson’s first successful single coil pickup design, found on many Gibson guitar models originating in the 50′s. It is larger than many modern pickups and are commonly found in the “soap bar” design, named so because it has a size and shape similar to a small bar of soap, or the “dog ear” design, which is characterized by a large triangular mounting surface at each end. P90′s are known for high output (for a single coil) and biting treble response. Nowadays there are many strengths and styles of “P90″ pickups from several manufacturers.