Bell inequalities are an important tool in device-independent quantum information processing because their violation can serve as a certificate of relevant quantum properties. Probably the best known example of a Bell inequality is due to Clauser. Horne. Shimony and Holt (CHSH). https://www.roneverhart.com/Jelly-Belly-Sparkling-Rose-Jelly-Beans-1-5-Ounce-Bottles-24-Piece-Box/