BIP39 means Bitcoin Improvement Proposal 39. The words are picked from a specific list of 2048 widespread English words that may be used to the deliver a binary seed (your personal vital). This information points out BIP39, the standard that defines how seed phrases are created, and summarizes how BIP32 https://bookmarkprobe.com/story19068500/little-known-facts-about-bip39-seed-phrase-list