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