In the rich text editor:
@colon_nine
In a comment:
[colon_nine](https://chowlings.com/user/colon_nine)
For Names and Avatars:
In the rich text editor:
%colon_nine
In a comment:
[](https://chowlings.com/user/colon_nine) [colon_nine](https://chowlings.com/user/colon_nine)
