O220 on the original packaging box of Ecuador shrimp is the identification of the production batch, which means that this batch of shrimp was produced on the 220th day of Ecuador local time. This identification method is mainly used to track the production date and batch of products to ensure the quality of products. In the field of food and agricultural products, the label of production batch is usually marked on the outer packaging of products so that consumers can know the production time and shelf life of products.