BIP39 stands for Bitcoin Improvement Proposal 39. The words are selected from a specific list of 2048 frequent English words which can be used to the deliver a binary seed (your non-public vital). In case you are unsure about a specific word's spelling, use the look for functionality (Ctrl+File on https://opensocialfactory.com/story21116713/facts-about-bip39-seed-phrase-word-list-revealed