Bip39 Seed. Push X to abort passphrase application and keep editing the passphrase. Picking out Terminate after an abort will quit the procedure. BIP39 is a style and design implementation that lays out how copyright wallets develop the list of words (or "mnemonic codes") which make up a mnemonic sentence, https://gatherbookmarks.com/story19570159/bip39-wallets-https-linktr-ee-bip39-not-known-details-about-bip39-list