BIP39 stands for Bitcoin Enhancement Proposal 39. The words are chosen from a particular list of 2048 popular English words which can be accustomed to the make a binary seed (your personal crucial). Standard recovery phrases use a particular list of 2048 words subsequent the BIP39 standard (Bitcoin Improvement Proposal https://dftsocial.com/story20405618/a-review-of-bip39-phrase-list