Term
Genesis block
The very first block in a blockchain, from which the entire chain begins. Bitcoin's genesis block was created on January 3, 2009.
See also
→→→
Satoshi
The smallest unit of Bitcoin, equal to one hundred-millionth (0.00000001) of a BTC. Named after Bitcoin's creator.
Fiat
Traditional government-issued currency not backed by a physical commodity, such as the US dollar, euro, or Czech koruna — as opposed to cryptocurrency.
Exchange
A platform for buying, selling, and trading cryptocurrencies. It can be centralized (CEX) or decentralized (DEX).