Bip39 bitcoin core http://www.mediafire.com/file/uilrjfajg2ami24/pdf-14673-57158.pdf Even though it utilizes BIP32 method it is possible to however import BIP39 seeds into Electrum wallet. Also in addition to BIp32 there is BIP44 version which some wallet use for that generation of seeds. BIP39 improves wallet security by making backups reliable, effortless, and resistant https://thefairlist.com/story10136315/bip39-word-list-json-helping-the-others-realize-the-advantages-of-bip39-passphrase-https-linktr-ee-bip39