BIP39 stands for Bitcoin Enhancement Proposal 39. The words are selected from a certain list of 2048 widespread English words which can be accustomed to the generate a binary seed (your personal important). Standard recovery phrases use a particular list of 2048 words pursuing the BIP39 standard (Bitcoin Advancement Proposal https://bookmarkbells.com/story18871322/ledger-seed-phrase-bip39-no-further-a-mystery