This is the name seen by everyone else when on IRC. You can use anything you like, but it can't contain particularly "weird" characters, so keep to alpha-numeric characters.
这是其他人在 IRC 上看到的名字。你可以使用任何你喜欢的字符，但它不能包含特别“奇怪”的字符，所以尽量使用字母和数字。