SU stands for "Standard Unit," which is a measurement used in various fields to provide a consistent way to quantify and compare different items. It helps in standardizing measurements, making it easier to communicate and understand data across different contexts. In the context of education, SU can also refer to Syracuse University, a private research university located in Syracuse, New York. Established in 1870, it offers a wide range of undergraduate and graduate programs and is known for its vibrant campus life and diverse student body.