non-fungible token 

noun

non-fun·​gi·​ble token

plural non-fungible tokens also nonfungible tokens

: a unique digital identifier that cannot be copied, substituted, or subdivided, that is recorded in a blockchain, and that is used to certify authenticity and ownership (as of a specific digital asset and specific rights relating to it)

also : the asset that is represented by a non-fungible token

abbreviation NFT

MERRIAM-WEBSTER  

blockchain

noun

block·​chain 

: a digital database containing information (such as records of financial transactions) that can be simultaneously used and shared within a large decentralized, publicly accessible network

also : the technology used to create such a database

MERRIAM-WEBSTER