High Quality Content by WIKIPEDIA articles! The Ryerson Students` Union (RSU) is the central students` union at Ryerson University representing all full-time undergraduate and graduate students. The RSU is formally known as the Ryerson Students Administrative Council (RyeSAC), and Student Union of Ryerson Polytechnical Institute (SURPI). The Students` Union represents 28,000 students and operates under 3 pillars: advocating for students` rights, providing cost-saving services, and building campus life.