Ellipsis trio (4)
I believe the answer is:
dots
'ellipsis trio' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dots that I've seen before include "Tiny circles" , "Tiny spots" , "Shorter signals in the Morse code" , "Tiny circular shapes" , "Short signals in Morse cods" .)