BIP39 stands for Bitcoin Advancement Proposal 39. The words are picked from a certain list of 2048 common English words which may be accustomed to the deliver a binary seed (your non-public critical). Standard recovery phrases use a particular list of 2048 words pursuing the BIP39 standard (Bitcoin Enhancement Proposal https://thebookmarkking.com/story18796814/little-known-facts-about-bip39-seed-phrase-list