Bip39 format example https://pixabay.com/users/51089543/ Though it takes advantage of BIP32 process you'll be able to continue to import BIP39 seeds into Electrum wallet. Also aside from BIp32 There is certainly BIP44 version which some wallet use to the technology of seeds. For words that have only three letters, there is https://easiestbookmarks.com/story20710789/bip39-wallet-list-bip39-compatible-wallet-an-overview-https-dzen-ru-bip39-phrase-com