This is a custom dimension of the type "Product Category". Here static information on a product is collected.
"Viewed" means that only products with the product status "view" are tracked.
Each metric combined with this dimension relates to viewed products.
"-" classifies all products that are not assigned to a product category.
We cannot provide further information here, as each Category is configured individually in your Mapp Intelligence system.
For further questions please contact your Mapp Intelligence administrator.