Oz is the abbreviation for ounces. The ounces and pints are common measurements in the U.S. Ounces and pints are usually not together because ounces usually measure weight of solid things for the most part. Pints will sometimes measure liquid. However, there is such a thing called a fluid ounce. This is usually shown on drinks. There are 16 fluid ounces in one pint. If you like to cook food, you may need to know how many ounces are in a pint.
Sometimes, cooks only have measuring devices or tools that measure ounces, so you would need to know the conversion. Sometimes, a recipe may ask for pints, but the ingredient that you bought at the grocery store is measured by ounces.