BIP39 means Bitcoin Enhancement Proposal 39. The words are picked from a particular list of 2048 widespread English words which can be accustomed to the produce a binary seed (your personal key). Standard recovery phrases use a selected list of 2048 words following the BIP39 standard (Bitcoin Improvement Proposal 39). https://getsocialnetwork.com/story4330243/fascination-about-bip39-english-words