BIP39 stands for Bitcoin Enhancement Proposal 39. The words are chosen from a particular list of 2048 widespread English words which may be accustomed to the create a binary seed (your personal important). For anyone who is unsure about a particular word's spelling, use the search perform (Ctrl+F on Windows/Command+F https://letsbookmarkit.com/story19436227/invalid-bip39-phrase-things-to-know-before-you-buy