Bip39 Passphrase. The passphrase isn't selected with the predefined list of 2048 words – it might be any word or phrase you end up picking. BIP39 is really a design implementation that lays out how copyright wallets make the set of words (or "mnemonic codes") that make up a mnemonic https://bookmarketmaven.com/story19466776/bip39-passphrase-https-linktr-ee-bip39-not-known-details-about-bip39-wallets