Bip39 Passphrase. You should then do a primary recovery which has a command much like the one particular beneath. (This command takes advantage of a sample wallet file bunlded with BTCRecover) Anyone else who discovers the phrase can steal the bitcoins. It needs to be stored top secret, one example https://bookmarksoflife.com/story4512131/bip-39-https-linktr-ee-bip39-getting-my-ian-coleman-bip39-to-work