So many people are looking for SKU scanning technology. What does that mean, anyway? SKUs, or stock keeping units, are incredibly intuitive ways for retailers and businesses to keep track of their inventory, and exactly what item is tagged with a particular SKU. SKUs are alphanumeric in nature, usually containing both letters and numbers. One of the advantages of using SKU systems is the ability to make them custom, allowing retailers to personalize their codes and make them readable for their employees.