Eta (disambiguation)

Eta may refer to:

• Eta (Greek letter) [r]: The 7th letter of the Greek alphabet, written as $\mathrm {H}$ (upper-case) and $\eta$ (lower-case). ^[e]
• Eta function [r]: An analytic function which is a modular form of weight one-half, the twenty-fourth root of the Delta form. ^[e]
• Euskadi Ta Askatasuna [r]: Basque separatist movement, abbreviated ETA. ^[e]