Just use BTC or satoshi (0.00000001) like in:
I just bought a car for 10 BTC!
The new Final Fantasy game will cost only 15000 satoshi!
Using mBTC, uBTC, μBTC is just unnecessary, sounds like a different coin and it will confuse a lot of people.
Coinedup and a few other sites are guilty of using mBTC.
1 satoshi is the smallest unit of BTC that's all people should have to learn. If you want massive user adoption you have to simplify things.
If you think microBitcoin sounds like a new coin I have doubts you finished high school

You do understand the concept of a centimeter right? You understand that it's the same as 0.01 M and not another unit of measurement? Come on, it's not rocket science.
I see you have 0 understanding of marketing, maybe you believe only
smart people should use bitcoin.
You might check other replies and notice that most agree bitcoin and satoshi are enough and more terms will just confuse people.