Why cant i us Ø for my clan name??

IIoWnAgEII

It stupid. [Ð1] ƒø®©e™ and [P]rØÐiGy.™ have it. PLus they have Ð and ®©. This is random. Can you tell me why this is??

Synetrix

This happened for me too. I wanted the trademark symbol in my clan, but it didn't let me, even though I have seen other clans with it.
I believe it may be that when you first create a clan you can't add symbols, but when you change the name through the mall item it is possible. Not 100% sure about this though.