Sergeants major, e.g.: Abbr

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Possible Answers: NCOS.

Random information on “NCOS”:
NCOS was the graphical user interface-based operating system developed for use in Oracle’s Network Computers.[1] It was adapted by Acorn Computers from its own RISC OS,[2][3] which was originally developed for their range of Archimedes desktop computers. It shares with RISC OS the same 4MB ROM size and suitability for use with TV displays.
Taken from Wikipedia