Homonym: OH (Oxygen)
OH stands for "Ohio," a state located in the Midwestern region of the United States. It is known for its diverse geography, which includes plains, hills, and rivers. The capital city is Columbus, and other major cities include Cleveland and Cincinnati. Ohio is often referred to as the "Buckeye State," named after the Ohio buckeye tree.
Ohio has a rich history and played a significant role in the development of the United States. It was the 17th state to join the Union in 1803. The state is known for its contributions to industry, agriculture, and education, with institutions like The Ohio State University being prominent in research and innovation.