BIP39 means Bitcoin Advancement Proposal 39. The words are selected from a selected list of 2048 typical English words which may be accustomed to the generate a binary seed (your personal critical). Standard recovery phrases use a specific list of 2048 words adhering to the BIP39 standard (Bitcoin Advancement Proposal https://yoursocialpeople.com/story4178063/bip39-phrase-generator-can-be-fun-for-anyone