Как по Английски будет этас

noun

The seventh letter of the greek alphabet ( η, η ), transliterated as ‘e’ or ‘ē’.

proper noun

A basque separatist movement in spain, founded in 1959.

abbreviation

Edited to add (used in online discussions to indicate that one has modified the content of a post one has made, typically in order to add something)

Примеры использования:

Eta: sorry, didn't see your post before i posted mine, @abc!