In the rich text editor:
@corvid
In a comment:
[corvid](https://chowlings.com/user/corvid)
For Names and Avatars:
In the rich text editor:
%corvid
In a comment:
[![corvid's Avatar](https://chowlings.com/images/avatars/102.png?v=1644063243)](https://chowlings.com/user/corvid) [corvid](https://chowlings.com/user/corvid)