Bip39 mnemonic seed phrase https://www.demilked.com/author/gobnettlmz/ Even though it uses BIP32 system it is possible to nonetheless import BIP39 seeds into Electrum wallet. Also other than BIp32 You can find BIP44 Variation which some wallet use with the generation of seeds. bip39-phrase.com is an informational blog dedicated to technologies and tools https://bookmarkinginfo.com/story20400982/bip39-bip32-bip39-compatible-wallet-can-be-fun-for-anyone-https-cutt-ly-uryc5rw7