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This airticle is aboot the Greek letter. For ither uises, see ETA (disambiguation).

Eta (uppercase Η, lawercase η; Greek: Ήτα Ēta) is the seivent letter o the Greek alphabet. Oreeginally denotin a consonant /h/, its soond value in the classical Attic dialect o Auncient Greek wis a lang vowel [ɛː], raised tae [i] in medieval Greek, a process kent as iotacism.

In the seestem o Greek numerals it haes a value o 8. It wis derivit frae the Phoenicie letter heth Phoenician heth.svg. Letters that arose frae Eta include the Laitin H an the Cyrillic letter И.