BIP39 means Bitcoin Improvement Proposal 39. The words are picked from a selected list of 2048 frequent English words that may be used to the generate a binary seed (your personal key). This information describes BIP39, the standard that defines how seed phrases are created, and summarizes how BIP32 and https://tornadosocial.com/story4434016/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool