BIP39 means Bitcoin Enhancement Proposal 39. The words are selected from a selected list of 2048 prevalent English words which can be accustomed to the produce a binary seed (your private important). Standard recovery phrases use a certain list of 2048 words subsequent the BIP39 standard (Bitcoin Improvement Proposal 39). https://wiishlist.com/story19438208/the-definitive-guide-to-bip39-seed-phrase