Crossword Genius

With 64-Across, symbol of coldness (3)

Ross

I believe the answer is:

ice

(Other definitions for ice that I've seen before include "Constituent of 2dn" , "Finish decorating the Christmas cake" , "Glaciate" , "Chill - harden" , "Some number" .)

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