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by mhurron 3653 days ago
Between versions 7 and 10 it was officially MacOS [VERSION], before that it was referred to as system [VERSION], as in System 6 and so on. That was not an official name, it was the version number of the file `system` and was simply the system that ran on a Mac, because there was only one.

It got the official name MacOS when they allowed the selling of clones.