In the rich text editor:
@tiphereth
In a comment:
[tiphereth](https://chowlings.com/user/tiphereth)
For Names and Avatars:
In the rich text editor:
%tiphereth
In a comment:
[![tiphereth's Avatar](https://chowlings.com/images/avatars/1081.png?v=1644063250)](https://chowlings.com/user/tiphereth) [tiphereth](https://chowlings.com/user/tiphereth)