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.