OS X is a former name of Apple's operating system macOS.
OSX or OS X may also refer to:
DC/OSx, 1980s-era Unix operating system by Pyramid Technology Old Saxon (ISO 639-3 language code), an early form of Low German OSX, a Brazilian shipbuilding company, part of the EBX Group OS-X series, a series of sounding rockets built by OneSpace Xalapa Symphony Orchestra, from an acronym for its Spanish name Orquesta Sinfónica de Xalapa
See also
System 10 (disambiguation) System X (disambiguation)