Bip39 Mnemonic Phrase. Although it employs BIP32 system you are able to even now import BIP39 seeds into Electrum wallet. Also besides BIp32 You can find BIP44 Model which some wallet use with the generation of seeds. The tool will counsel a number of choices for the missing word as https://andersonbmyhs.wikimillions.com/3572515/the_anatomy_of_a_bip39_phrase_entropy_phrases_and_stability