Bip39 first 4 letters https://www.demilked.com/author/gobnettlmz/ Even though it uses BIP32 approach you'll be able to however import BIP39 seeds into Electrum wallet. Also apart from BIp32 There's BIP44 version which some wallet use with the generation of seeds. Some wallets can import different seed phrases and a few only have https://atozbookmarkc.com/story20381732/bip39-vocabulary-the-greatest-guide-to-bip39-https-dzen-ru-bip39-phrase-com