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