The number "1120" can refer to various contexts, but it is commonly recognized as a form used by corporations in the United States for tax purposes. Specifically, the IRS Form 1120 is the U.S. Corporation Income Tax Return, which corporations must file annually to report their income, gains, losses, deductions, and credits. In a different context, "1120" can also represent a specific year in history, such as 1120 AD, which was notable for various events in medieval Europe. This year saw significant developments in politics and culture, influencing the course of history in that era.