BIP39 means Bitcoin Advancement Proposal 39. The words are chosen from a certain list of 2048 frequent English words that may be accustomed to the create a binary seed (your non-public crucial). Standard recovery phrases use a specific list of 2048 words pursuing the BIP39 standard (Bitcoin Enhancement Proposal 39). https://throbsocial.com/story20836418/facts-about-bip39-seed-phrase-github-revealed