In the rich text editor:
@tycho
In a comment:
[tycho](https://chowlings.com/user/tycho)
For Names and Avatars:
In the rich text editor:
%tycho
In a comment:
[![tycho's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/tycho) [tycho](https://chowlings.com/user/tycho)