Bits
"Bits" are shorthand for one-millionth of a Bitcoin (1 Bit = 0.000001 ฿). It's becoming increasingly popular to use as the price of bitcoin rises and small transactions have numerous decimal places.
Also of note is that a "bit" is equivalent to 100 satoshi, which is the smallest unit of measurement of bitcoin on its blockchain, and is used to quote prices of transaction fees, and record transaction amounts on the blokchain.