1 bit is also 1/8 of one USD.
Seeing all the hoopla over BTC versus XBT I would support the following:
1 BTC = 1 Bitcoin = same as it ever was
1 XBT = 1 Bit = 0.000001 BTC
1000000 XBT (Bit) = 1 BTC (Bitcoin)
I would be behind this 100% as it "fixes" the whole BTC/XBT issue and give those who have been worried about the size of the BTC something to use.