Bip39 first 4 letters https://www.plurk.com/p/3hf2syltjx While it works by using BIP32 process you can still import BIP39 seeds into Electrum wallet. Also besides BIp32 You can find BIP44 Variation which some wallet use for that technology of seeds. BIP39 simplifies essential administration by changing lengthy cryptographic knowledge with effortless-to-use words. https://rentry.co/p68weyby