5 ms·

I'd go with one of these: * macOS (née Mac OS X) * macos (formerly Mac OS X)

• IggleSniggle 7y ago
  Ah yes, the classic game: - "macos!" - "polos!"
  • joombaga 7y ago
    Didn't mean to lower case that one.
• gbear605 7y ago
  The operating system formerly known as Mac OS X
  • toyg 7y ago
    TOSFKAMOSX. Rolls off the tongue almost as well as TAFKAP.