Crossword Genius

When an Uber should show up: Abbr (3)

Ross

I believe the answer is:

eta

(Other definitions for eta that I've seen before include "When you'd expect to see" , "Greek letter - Basque nationalist movement" , "Something like 10 [RHO]" , "Letter from abroad" , "Seventh Greek letter" .)

I've seen this clue in the Universal.
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