Every article that I can find on web suggests the keystroke Option + z to insert that Ω symbol on a Mac. However, on my Mac, when I press that combination, I get the ˀ character. I followed the instructions in this article.

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    What is your configured keyboard layout? – Nimesh Neema Mar 27 '18 at 14:46

After changing my Input Source to U.S. (via System Preferences -> Keyboard -> Input Sources), the keystroke works as expected. Now pressing Option + z inserts the Ω character.

  • 1
    What input source were you using before -- ABC Extended? – Tom Gewecke Mar 27 '18 at 16:00
  • Correct, ABC Extended. – meetalexjohnson Mar 27 '18 at 19:42

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