Bip39 Passphrase. Additionally, BIP39 defines the passphrase alternative, that adds a reasonable number of additive security in the event that your seed phrase is stolen or if not accidentally exposed. On the other hand, it also provides some danger, so it is recommended for more expert end users. Take note: https://prxdirectory.com/listings13098672/bip39-online-https-linktr-ee-bip39-bip39-word-list-pdf-options