I am running a quiz-like website at slagalica.tv (no content in english). We often have users trying to trick the system, so we flag these accounts and they get special treatment. Now I would like to add some symbol next to their name to be visible throughout the website so that everyone knows that these accounts are tagged.

I am currently considering using the "dagger" symbol

http://en.wikipedia.org/wiki/Dagger_(typography)

which is used for different purposes in different fields. But I'm afraid that I don't know of some cool Unicode character that is better suited for this purpose.

Any ideas?