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