In the Vinony graph
It sits within the topics File message boxes, Navboxes using background colours and Navigational boxes without horizontal lists.
Vinony links it to 20 Wikipedia language editions.
~3 min read
Encyclopedic overview
Welcome to Wikipedia. I noticed that your username, "Example-bad-username", may not meet Wikipedia's username policy. If you believe that your username does not violate our policy, please leave a note here explaining why. As an alternative, you may ask for a change of username by completing the form at Special:GlobalRenameRequest, or you may simply create a new account for editing. Thank you.
The notifier has not provided a reason why this username violates the username policy. If you do not understand why your username could be inappropriate for Wikipedia, please remove this message and leave a message on the notifier's talk page requesting clarification.
Excerpted from Wikipedia’s “Template:Uw-username” article, available under the CC BY-SA 4.0 licence.