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