Bip39 Key. Though it utilizes BIP32 process you are able to however import BIP39 seeds into Electrum wallet. Also in addition to BIp32 there is BIP44 version which some wallet use to the era of seeds. As you can see, they're normal words which might be simple to retail store https://webnowmedia.com/story4053129/not-known-factual-statements-about-bip-39