Lol...I think having a significant value behind the international definition is wise and therefore I support making 1 bitcoin the official unit associated with an ISO 4217 standard and Unicode currency symbol.

That said, I think we need at least two symbols to describe bitcoin subunits.  My wife had a good idea for symbols and I turned it into a web font...


http://www.uofr.net/~bcg/bitcoin.html

I did this on my iPad in a hurry.  I over wrote %, ^, &, and * symbols instead of using unassigned or private use Unicode code points...

The m-like symbol for mBTC is just the BTC symbol turned on it's side to look like an m.

The satoshi symbol is the greek letter sigma with an extra line...it's also basically the same as the bits symbol turned on it's side.