Crossword Genius

The Sixers, on scoreboards (3)

Ross

I believe the answer is:

phi

(Other definitions for phi that I've seen before include "Letter from the Balkans" , "Greek character" , "Twenty First Greek letter, pronounced as f" , "Greek letter; sounds like expression of outrage" , "Greek letter; hip (anag.)" .)

I've seen this clue in the USA Today and The New York Times.
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