0.0005 bitcoins or 0.0005 bitcents?
Come to think of it. Is there even a standardized naming system for "bitcoin" "bitcents" "microbitcoin (uBTC)"
SI units in orders of 10^n3. Giga, Mega, Kilo, milli, micro, nano, pico... As for naming, your guess is as good as any μBTC, microbitcoin, microbit, microbtc.