In the rich text editor:
@D3cimation
In a comment:
[D3cimation](https://chowlings.com/user/D3cimation)
For Names and Avatars:
In the rich text editor:
%D3cimation
In a comment:
[![D3cimation's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/D3cimation) [D3cimation](https://chowlings.com/user/D3cimation)