Bip39 spec https://www.empowher.com/user/4550298 Despite the fact that it employs BIP32 system you could still import BIP39 seeds into Electrum wallet. Also apart from BIp32 There's BIP44 version which some wallet use for your generation of seeds. Mainly because incorporating a passphrase in your seed words makes a completely new wallet, https://agendabookmarks.com/story20458692/bip39-condensed-pdf-bip39-converter-an-overview-https-x-com-tundra838554