BIP39 means Bitcoin Advancement Proposal 39. The words are picked from a certain list of 2048 typical English words which can be utilized to the create a binary seed (your private important). BIP39 and 44, However, certainly are a more recent form of standardization of a selected list of words https://bookmarkworm.com/story19562323/an-unbiased-view-of-bip39-seed-phrase-github