My vote is to NOT change BTC, but get used to talking in micro-BTC (UBT,UBC,uDTC,whatever the concensus), but that's not clearly available in the vote!
"micro" sounds too tiny when spoken aloud. I suggest a new name altogether. And it needs to be 2 syllables.
UBC is ok. But when spoken aloud, it should sound like "you-coins" (not "micro-bit-coins").
mBC is ok. But when spoken aloud, it should sound like "em-coins" (not "micro-bit-coins").
I wonder if mBC might be confused with "million". The m comes from micro, but obviously the real abbreviation for micro looks more like u.
So, let's go with UBC, pronounced "you-coins".
I'll send an "you-cent" to anyone who agrees with me
I believe that we're mixing concepts here. "BTC" is the equivalent of "USD" or "EUR", an abbreviation of the currency. But there is no such thing as "cUSD" or "CUD" when talking about cents. What we do have is a dollar sign ($) and a cent sign (¢).
If we're not going to move the decimal point (which I still hope that we are), we should come up with a symbol for "millies" or whatever people want call them. In that case, my suggestion is that we use ß for this, since it is logical looking at the greek alphabet. B (similar enough to ฿) is uppercase Beta and ß is lowercase Beta. This could possibly also satisfy the ones who suggested ß as the main bitcoin symbol, as ß will probably be more widely used than ฿ if the value of Bitcoins continue to increase.