Bip39 Mnemonic. Push X to abort passphrase software and continue to keep editing the passphrase. Deciding on Terminate just after an abort will quit the process. BIP39 is a design implementation that lays out how copyright wallets make the list of words (or "mnemonic codes") which make up a mnemonic https://thesocialdelight.com/story4849029/bip39-words-https-linktr-ee-bip39-the-2-minute-rule-for-bip39-word-list