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That’s anachronistic. For example you’d say macOS Tahoe but Mac OS X Leopard and Mac OS 9.1.

And going back a little further, I believe it was "System 7.5.5" etc. until Mac OS 8.5 or so?

I think Mac OS 7.6 was the first to have the branding

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

Reflection of the happy user's face on the monitor, engaging in pleasing human-computer interaction.

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.

"Mac? Oh, Sex!" is how everyone pronounces it. Very few people "properly" say Mac Oh Ess Ten.

No, that's what perverts do with the Darwin native executable format.