BIP39 stands for Bitcoin Advancement Proposal 39. The words are chosen from a selected list of 2048 typical English words that may be used to the make a binary seed (your private critical). BIP39 and 44, On the flip side, are a Newer form of standardization of a specific list https://doctorbookmark.com/story18916201/facts-about-bip39-seed-phrase-github-revealed