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And going back a little further, I believe it was "System 7.5.5" etc. until Mac OS 8.5 or so?
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I think Mac OS 7.6 was the first to have the branding
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the "two face" logo.. the reference was, the logo could be a single face, or a face in the distance with a second as profile in front. IIR
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Reflection of the happy user's face on the monitor, engaging in pleasing human-computer interaction.
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While we are on the subject it is also worth pointing out additionally:

When saying Mac OS X, it’s pronounced Mac OS ten, not Mac OS ex.

https://www.youtube.com/watch?v=dHrVGk0WwYM

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"Mac? Oh, Sex!" is how everyone pronounces it. Very few people "properly" say Mac Oh Ess Ten.
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No, that's what perverts do with the Darwin native executable format.
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