which characters are valid ones in bitcointalk usernames?

[Jawguy]

I found this profile:

https://bitcointalk.org/index.php?action=profile;u=381968

Pretty cool, has a nice lower case mu as the username.  I like it.  But when I tried to create an account with a greek letter in it, I got "Error: Invalid character in username."

So I want to know which characters are allowed in a username.

[Undermood]

 I think Non-latin characters in username is allowed, like user Cøbra, https://bitcointalk.org/index.php?topic=888747.0

[Foxpup]

I'm pretty sure usernames use ISO 8859-1 (Latin-1). That character set only includes lowercase mu due to that character's use as the standard abbreviation for "micro"; it has no other Greek characters.

I think Non-latin characters in username is allowed, like user Cøbra, https://bitcointalk.org/index.php?topic=888747.0

"ø" is a Latin character, regardless of what Cøbra seems to think.

[Jawguy]

I'm pretty sure usernames use ISO 8859-1 (Latin-1). That character set only includes lowercase mu due to that character's use as the standard abbreviation for "micro"; it has no other Greek characters.

I think Non-latin characters in username is allowed, like user Cøbra, https://bitcointalk.org/index.php?topic=888747.0

"ø" is a Latin character, regardless of what Cøbra seems to think.

Thanks you guys.  I was away for a while but now I see this.  It seems that latin-1 is okay but not general unicode.