BIP39 means Bitcoin Advancement Proposal 39. The words are chosen from a selected list of 2048 typical English words which may be used to the crank out a binary seed (your private essential). This text explains BIP39, the standard that defines how seed phrases are made, and summarizes how BIP32 https://geniusbookmarks.com/story18896286/new-step-by-step-map-for-bip39-english-words