What is a group of papers called?

A group of papers is called a ream. A ream is defined as a package of paper containing 500 sheets. This term is most often used in the context of printer paper, but it can also be used for other types of paper, such as construction paper or cardstock. The word "ream" is derived from the Old French word "rayme," which meant "a bundle of paper." Reams of paper are often sold in packs of 10 or 20, and they can be purchased at most office supply stores.