Bip39 or slip39 https://500px.com/p/alexzhiglatyxrnxb Though it takes advantage of BIP32 approach it is possible to however import BIP39 seeds into Electrum wallet. Also apart from BIp32 There is certainly BIP44 Variation which some wallet use with the generation of seeds. It really is very simple — if you don't concern https://thefairlist.com/story10504319/bip39-english-words-bip39-compatible-wallet-options-https-linktr-ee-bip39