eszet (ss, sz, ß, call it whatever yo u want)

AFAIK, in German there are some specific cases in which you have
to use ß instead of ss. Needless to say, it was not the same throughout
Germandom: in Switzerland, the character is not used. The writing 
reform happened some years ago changed again things, reducing the number
of cases in which ß has to be used. Moreover, there is no uppercase 
form: you have to write SS. In short, a mess :-)

> I assume Germans use it to write German words. Not
> to replace double s in non-German names.

Yes, but we could have a mixed-language domain name: what about
paß-per-tutti.it ?

ciao, .mau.