Crossword Genius

Difference symbol, in math (5)

Ross

I believe the answer is:

delta

(Other definitions for delta that I've seen before include "Letter - where river divides" , "Fragmented estuary" , "Comms code for 'd'" , "Nile river mouth" , "Daedalus started with this" .)

I've seen this clue in The New York Times.
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