BIP39 means Bitcoin Advancement Proposal 39. The words are selected from a selected list of 2048 widespread English words which can be accustomed to the create a binary seed (your non-public essential). Standard recovery phrases use a particular list of 2048 words adhering to the BIP39 standard (Bitcoin Enhancement Proposal https://zenwriting.net/keenanctdp/h1-b-unlocking-the-power-of-bip39-a-comprehensive-look-at-word-lists-and