BIP39 stands for Bitcoin Advancement Proposal 39. The words are selected from a selected list of 2048 frequent English words that may be accustomed to the deliver a binary seed (your non-public vital). Standard recovery phrases use a certain list of 2048 words pursuing the BIP39 standard (Bitcoin Enhancement Proposal https://bookmarklogin.com/story18937294/ledger-seed-phrase-bip39-no-further-a-mystery