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