While units in Bitcoin follow the Standard Metric Notation system, this page lists the most commonly used units. These can be written/typed/expressed in any number of ways. From using some form of the prefix, to an abbreviation of both the prefix and adding bit/bitcoin.
|Unit||Abbreviation||Decimal (BTC)||Alternate names||Info|
|millibitcoin||mBTC||0.001||millibit, millicoin, and millie||Thousandth of a Bitcoin|
|microbitcoin||μBTC||0.000001||bit||Millionth of a Bitcoin|
|satoshi||sat||0.00000001||none||100 millionth of a Bitcoin, the smallest unit currently possible to represent, named after the inventor|
Alternate systems for representing Bitcoin units exist, such as Tonal Bitcoin (TBC).