Ellipsis = three dots (…)
Also see: Typing awareness indicator
In my case — in the particularly high-stakes conversation at hand — it was the bubble that popped up to indicate typing, then disappeared to show he had stopped. Then came back up to show typing, then went away again. Then returned for what seemed like an eternity (he must be writing something deep, right?) only to produce a response so benign (you know, like “cool” or “ya”) that it could only be topped by the humiliation of the bubble never returning at all (meaning he was flat-out ignoring me). Which I would know, of course, because I could see that he had read my message (that’s called a “read receipt”). – – Jessica Bennett, Bubbles carry a lot of weight, New York Times
Direct messages in Hangout Chat now have typing indicators. My favorite thing to do is to type a bunch of stuff for a long type and then delete it and respond with "ok."
— Scott Johnston (@happyinwater) February 13, 2019