BIP39 stands for Bitcoin Enhancement Proposal 39. The words are chosen from a selected list of 2048 popular English words which may be used to the generate a binary seed (your private crucial). Standard recovery phrases use a specific list of 2048 words next the BIP39 standard (Bitcoin Improvement Proposal https://www.animenewsnetwork.com/bbs/phpBB2/profile.php?mode=viewprofile&u=1025088