Crossword Genius

Morse code units (4)

Ross

I believe the answer is:

dots

'morse code units' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for dots that I've seen before include "Short signals in Morse cods" , "Tiny spots" , "Tiny circles" , "Tiny circular shapes" , "Small marks" .)

I've seen this clue in the USA Today.
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