BIP39 means Bitcoin Improvement Proposal 39. The words are chosen from a particular list of 2048 typical English words which can be used to the produce a binary seed (your private key). BIP39 and 44, Conversely, certainly are a more recent method of standardization of a specific list of words https://thesocialroi.com/story8806159/examine-this-report-on-bip39-mnemonic-phrase-tool