Three dominant themes in the discussion
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Correct capitalisation and naming
“It’s ‘Mac OS’, not ‘macOS’, or even ‘MacOS’ (which is the title on the actual page).” — kergonath -
Pronunciation of the version number
“When saying Mac OS X, it’s pronounced Mac OS ten, not Mac OS ex.” — QuantumNomad_ -
Historical naming transition and version references
“And going back a little further, I believe it was ‘System 7.5.5’ etc. until Mac OS 8.5 or so?” — geerlingguy “Pre‑OS X (what actually runs in the blog post) it was Mac OS. Then, it was Mac OS X. The first version styled macOS was 10.12 Sierra in 2016.” — kergonath