International geo sample numbers are special numbers that are used to track where products are shipped around the world. A product manufacturer may give each product a special number so that they can make sure that it gets to the right place. This number can also tell the company where the product is located and let them know when it has been shipped. For example, if you buy something from a store in another country, the store might give your purchase an international geo sample number so that your purchase can be tracked.