BIP39 stands for Bitcoin Improvement Proposal 39. The words are selected from a certain list of 2048 prevalent English words which may be accustomed to the make a binary seed (your non-public vital). Standard recovery phrases use a particular list of 2048 words subsequent the BIP39 standard (Bitcoin Improvement Proposal https://doctorbookmark.com/story19037253/a-review-of-bip39-passphrase