This user on Ask Different appears to have no name due to invisible Unicode characters:
he's the #2 user on the site:
Why is that allowed? I think it is confusing for users, e.g. when they will see at the bottom of an answer:
It's not clear who answered, not clear what the rep numbers and badges are related to, and not clear how you can @reply to that user in the comments!
U+034F ͏COMBINING GRAPHEME JOINERis allowed as a “character” in usernames