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