Of course it is difficult for an ordinary person to buy a whole one bitcoin. Therefore, in the practice of trade, the fragmentation of bitcoin is common. The smallest part of Bitcoin is called Satoshi. Bitcoin can be divided up to eight symbols after the comma. So one bitcoin can be divided additionally into 100,000,000 units. Each Bitcoin unit (0.00000001 BTC) is named Satoshi. Satoshi is the smallest part of Bitcoin. It has such name because of Satoshi Nakamoto, the pseudonym of the founder of Bitcoin. So you see there is an opportunity to buy only a bit of Bitcoin. The name Satoshi is rarely used. More common thing is that the decimal fractions is written and the sign BTC is added to it. That's all!
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