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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. Bitcoin as a unit of account is commonly written without capitalization.

Unit Abbreviation Decimal (BTC) Alternate names Info
bitcoin BTC 1 coin one bitcoin
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).