BIP39 means Bitcoin Advancement Proposal 39. The words are chosen from a selected list of 2048 widespread English words which can be used to the generate a binary seed (your private critical). This post clarifies BIP39, the standard that defines how seed phrases are made, and summarizes how BIP32 and https://nimmansocial.com/story8589135/considerations-to-know-about-bip39-word-list-pdf