BIP39 means Bitcoin Improvement Proposal 39. The words are picked from a selected list of 2048 widespread English words that may be used to the crank out a binary seed (your non-public crucial). Standard recovery phrases use a certain list of 2048 words pursuing the BIP39 standard (Bitcoin Enhancement Proposal https://thesocialroi.com/story8674342/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting