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Comment by 27182818284 | Hacker News Reader

If you use the say command in the Terminal you get the definitive answer.

Spoiler alert for anybody without access to a mac right now: $ say "OS X" pronounces it as "OS Ten".

Mine says "os ex". (10.11.5)

All caps.

There has to be a space between the OS and X for it to work for me.

Its rules for pronouncing "X" are also distinct in these cases:

  say "Malcolm X"
  say "Louis X"

Hah, it does roman numerals up to 49

say Louis XLIX = Louis the 49th say Louis L = Louis L