Oh, i have said this before, anything beyond satoshis and bitcoins is useless, especially mBTC
Anyone in any country that uses the SI-system understands what mBTC means. It's still my favourite unit: not too big, not too small. It's closest to euro/dollar in value, and thus very convenient for "daily" amounts.But these all symbols resembles the USD.
That's exactly what I noticed instantly. Although it's quite clever to combine the "S" from Satoshi with the second and third character ("at") in the form of "@".BTC-8
It looks good, but it's terrible to type.The key part of why there's no prefix for satoshi is that the closest one would be nano (10-9) whereas you would need to do 10nBTC, kind of ugly. Maybe a better answer is XnBTC (using roman numeral)?
The fact that Bitcoin can be divided into 8 decimals confused me for much longer than it should have. With fiat, 2 decimals is easy. Anything with 3 decimals is common too (thousand, million, billion). But 8 decimals is just weird 
And it's far too big to count: you can't instantly see the value of 0.0000002 BTC without carefully counting the zeros.Why we just don't represent it like sBTC
It doesn't fit the SI-prefixes.For now, I'll keep using what I've been using for a long time:
BTC (for big amounts)
mBTC (for more common amounts, although I usually add the Bitcoin amount for people who don't understand it)
satoshi (written in full or as "sat") (for small amounts).
Example
Amount: 0.1 mBTC (0.0001 BTC, or 10,000 satoshi).
Interest: 1% (0.001 mBTC (=0.000001 BTC or 100 satoshi)).
Interest: 1% (0.001 mBTC (=0.000001 BTC or 100 satoshi)).