In theory, the first block of every blockchain project can be called a creation block, the first block mined by Bitcoin is called a creation block, and the first block mined by Ethereum A block is also a genesis block.
Genesis-God used his own ability to create all things, and then he has the present world.
This is of course a mythical story, but later, people continued to use the concept of "Genesis" to describe an unprecedented pioneer.
Then, according to this logic, the meaning of the genesis block refers to the first block in history.