They could be initials and I don't know about the numbers, but "Io" is one of Jupiter's moons.
debussey posted to me in PM that my nickname was genius because it is "input/output" which is apparently a computer term... he then proceeds to send pictures of hard dildos as that could be the "input"... so there could be a sexual/technical connection there... as far as the numbers it was random in retrospect I should have put meaning to it