BIP39 stands for Bitcoin Improvement Proposal 39. The words are picked from a selected list of 2048 common English words which may be used to the make a binary seed (your non-public key). This extra complexity improves the danger of misplacing the passphrase, and thus getting rid of your copyright. https://pr6bookmark.com/story18961034/bip39-phrase-generator-can-be-fun-for-anyone