Bip39 Passphrase. Because of the cryptographic style of BIP-39, a weak passphrase would not lessen the security of the opposite wallets or help expose the seed words. And you should have prepared it down for those who have been hoping to help keep a possibility open to revive your accounts. https://thegreatbookmark.com/story18800428/bip-39-https-linktr-ee-bip39-bip39-generator-an-overview