BIP39 stands for Bitcoin Enhancement Proposal 39. The words are selected from a certain list of 2048 frequent English words that may be used to the crank out a binary seed (your private important). Standard recovery phrases use a specific list of 2048 words subsequent the BIP39 standard (Bitcoin Improvement https://madesocials.com/story4269081/invalid-bip39-phrase-things-to-know-before-you-buy