In the rich text editor:
@ReihernderReiher
In a comment:
[ReihernderReiher](https://www.whistlercrest.com/user/ReihernderReiher)
For Names and Avatars:
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%ReihernderReiher
In a comment:
[](https://www.whistlercrest.com/user/ReihernderReiher) [ReihernderReiher](https://www.whistlercrest.com/user/ReihernderReiher)