In the rich text editor:
@Type-3
In a comment:
[Type-3](https://chowlings.com/user/Type-3)
For Names and Avatars:
In the rich text editor:
%Type-3
In a comment:
[![Type-3's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Type-3) [Type-3](https://chowlings.com/user/Type-3)