@who

[GM-Ayu]

It's a possibility, just like how the same symbol was allowed back then in character names, but we prohibit that character in char names and follow general computer file name protocol instead.

I don't think it's guild name though but probably someone's party name instead. I believe I @who (or any commands) just fine if I see someone from a guild with the yen symbol... I haven't got gravity error as a result of commands lately. I'll try to note down everyone's party name if it happens again for me.