The Sigma Upsilon Chapter for Delta Sigma Pi - University of Washington Delta Sigma Pi is a co-ed professional business fraternity founded in 1907 with over 240,000 members internationally. In 2013, the University of Washington established its chapter - the Sigma Upsilon Chapter - after only 9 months as a colony. We live by our 4 pillars: Professionalism, Community Service, Scholarship, and Brotherhood.