[G*Mafia]

How can I allow symbols in my server? for example : * and _ and ! etc..
?

[Mike Garber]

Do you mean playername? Either way those symbols are allowed as default (except * and !).
You cannot allow * and ! in their playername.

[G*Mafia]

Yes in their playername, As I seen in CrazyBob CnR, it is possible to add symbols to player name.