O.K., I know I'm nitpicking, but I can't help myself. :-)

eikosi is usually transliterated into Latin/English as icos-, like the icosohedrons, which are eikosoedra en Greek (h being only possible at the beginning of a word or in combination with p, r, c, or t...).

That said, it's an interesting number system, for not having a zero. It's commutative, associative, etc., but has no additive identity (unless you define the addition so that A is zero, of course).