FOS, MOS, and TOS may refer to any of the following:

  1. FOS, MOS, and TOS may be used as shorthand for father over shoulder, mother over shoulder, and teacher over shoulder. These acronyms are sometimes used as code to explain that the user might not be speaking freely because an authority figure is nearby or watching.

  2. MOS is also short for metal-oxide semiconductor, see the MOS definition for additional information about this term

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  1. TOS is also short for other terms. See the TOS definition for additional information about this term.

CD9, Chat terms, Computer abbreviations, MOS, PAW, POS, TOS