BIP39 stands for Bitcoin Advancement Proposal 39. The words are picked from a selected list of 2048 common English words which can be used to the produce a binary seed (your private key). Standard recovery phrases use a particular list of 2048 words pursuing the BIP39 standard (Bitcoin Enhancement Proposal https://mysitesname.com/story9271568/the-2-minute-rule-for-bip39-all-words