Bip39 Seed. If you'd like to refresh your memory about the fundamentals of how copyright wallet seed phrases and passphrases work, consider reviewing the Vault12 report concerning the BIP39 standard. The BIP39 standard also defines an option for users to add a long "password" of kinds into a seed phrase. https://lifesdirectory.com/listings13040475/bip39-dictionary-https-linktr-ee-bip39-5-simple-statements-about-bip39-compatible-wallet-explained