A millibitcoin (mBTC) is one thousandth of a bitcoin, that is, 0.001 BTC. This fractional unit is used to conveniently display small amounts in this cryptocurrency.

A microtransaction is a payment of a very small amount, often less than the minimum monetary unit. Such operations are unprofitable for traditional payment systems because of fees, while cryptocurrencies make them feasible.

A merchant account is a special trade account for a business used to accept non-cash payments by cards and over the internet. It links the seller to the payment infrastructure and the acquiring bank.

A merchant is a trade or service business that accepts payment cards and, in many cases, cryptocurrencies. The term comes from the English word merchant.

Margin trading is trading on an exchange using borrowed funds that increase the size of a position through leverage. The method can amplify both a trader's profit and losses.