Bip39 Standard. The passphrase is not really picked through the predefined list of 2048 words – it can be any word or phrase you decide on. BIP39 specifies a list of 2048 words from which the mnemonic phrase is chosen. Every word signifies a quantity inside of a binary sequence, https://bookmarkspring.com/story13920995/bip39-https-linktr-ee-bip39-a-review-of-bip39-words