What is 8so3?

8SO3 is not a standard chemical formula. However, it seems to be a misrepresentation or typo, possibly referring to sulfur trioxide (SO3), which is a chemical compound consisting of one sulfur atom and three oxygen atoms. Sulfur trioxide is a colorless liquid that is used primarily in the production of sulfuric acid. If you meant something else by "8SO3," please provide more context.