BIP39 means Bitcoin Improvement Proposal 39. The words are selected from a certain list of 2048 prevalent English words that may be accustomed to the produce a binary seed (your private important). Standard recovery phrases use a specific list of 2048 words following the BIP39 standard (Bitcoin Improvement Proposal 39). https://bookmarkspy.com/story20906974/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39