looks like i won't be able to get ∃.radio after all.
according to [RFC5982][1], [IDNA2008][2] makes code point 0x2203 invalid:
> 2190..23E8 ; DISALLOWED # LEFTWARDS ARROW..DECIMAL EXPONENT SYMBOL
i thought 0x1F6B5 might be nice (🚴.bike of course), but:
> 1F249..1FFFD; UNASSIGNED # <reserved>..<reserved>
huh?
[1]: https://tools.ietf.org/html/rfc5892
[2]: http://www.unicode.org/reports/tr46/