BIP39 means Bitcoin Improvement Proposal 39. The words are picked from a specific list of 2048 prevalent English words that may be used to the deliver a binary seed (your private crucial). Standard recovery phrases use a particular list of 2048 words following the BIP39 standard (Bitcoin Advancement Proposal 39). https://advicebookmarks.com/story26748022/an-unbiased-view-of-bip39-seed-phrase-github