BIP39 means Bitcoin Improvement Proposal 39. The words are chosen from a particular list of 2048 typical English words which can be accustomed to the deliver a binary seed (your personal essential). Standard recovery phrases use a certain list of 2048 words next the BIP39 standard (Bitcoin Advancement Proposal 39). https://bookmarksoflife.com/story4393669/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator