What are some examples of obsolete letters from the Greek alphabet

Greek Alphabet Chart

10 Letters That Didn't Make the Alphabet

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How to write a sentence only using each of the Greek alphabet once? What does it say in English - Quora

Ancient letters hi-res stock photography and images - Alamy

The stories behind the letters of our alphabet

Ancient Greek Alphabet, Ancient History

How would you spell all the names of the Greek letters with Greek letters themselves? (example: α would probably be something like 'αλφα' in the Greek spelling) - Quora

Greek Alphabet Letters

What letters are missing from the Greek alphabet? - Quora

Hebrew and Greek Alphabets Stock Photo - Alamy

Greek Numbers

Greek alphabet for Polish (MGS) chart. Now I am civilized. : r/neography