Bip39 Entropy. Though it utilizes BIP32 technique you can still import BIP39 seeds into Electrum wallet. Also in addition to BIp32 You can find BIP44 version which some wallet use for the technology of seeds. A standard 12-word mnemonic phrase is greatly utilised as a result of its manageable size https://ezmarkbookmarks.com/story18700936/seed-phrase-wallet-generator-an-unbiased-view-of-bip39-word-list