BIP39 stands for Bitcoin Advancement Proposal 39. The words are chosen from a specific list of 2048 typical English words that may be accustomed to the crank out a binary seed (your personal important). Standard recovery phrases use a certain list of 2048 words following the BIP39 standard (Bitcoin Improvement https://techonpage.com/story4238068/invalid-bip39-phrase-things-to-know-before-you-buy