BIP39 means Bitcoin Enhancement Proposal 39. The words are selected from a selected list of 2048 prevalent English words which can be used to the produce a binary seed (your non-public key). This article explains BIP39, the standard that defines how seed phrases are made, and summarizes how BIP32 and https://wiishlist.com/story19420290/new-step-by-step-map-for-ledger-seed-phrase-bip39