Mos is the singluar form of the more commonly used plural noun Mores.

The acronym MOS may mean several things, depending on context:

• Media Object Server - XML protocol for television system automation.
• Mos Burger - an upper class hamburger restaurant chain in Japan.
• Military Occupational Specialty - milspeak for one's job in the armed forces. See Military Occupational Specialty
• Mobile Operating System - a Soviet clone of Unix. See MOS (operating system).
• Maintenance Operating System - See maintenance OS.
• Member of the Opposite Sex.
• MOS Technology - now defunct electronics company owned by Commodore International.
• Metal Oxide Semiconductor - see MOSFET (metal oxide semiconductor field effect transistor).
• Mit Out Sound or Mit Out Sprache cameras - MOS is a designation used on clapper boards to denote that no sound is being recorded in sync with the film. MOS cameras are film cameras without crystal-pulse capability, which is required to maintain a constant speed for sync sound. (Some British cinematographers maintain that "MOS" actually stands for "Motion Omit Sound." Some others say it stands for "Minus Optical Sound".)
• Mambo Open Source, website content management system.
• Ma On Shan - a new town in Shatin, Hong Kong Special Administrative Region, China
• Mittelstandskinder Ohne Strom - a psychedelic trance (form of electronic music) project from Germany.
• Multi-Object Spectrometer - an astronomical instrument for measuring the spectrum of several targets simultaneously

See also: List of acronyms