Sigma Theta Tau International Honor Society of Nursing (Sigma) – In 1922 six nurses founded Sigma at the Indiana University Training School for Nurses, now the Indiana University School of Nursing, in Indianapolis, Indiana, USA. The founders chose the name from the Greek words Storgé, Tharsos, and Timé meaning "love," "courage," and "honor." Sigma became incorporated in 1985 as Sigma Theta Tau International Inc., a nonprofit organization with a 501(c)(3) tax status in the United States. Our Mission: Developing nurse leaders anywhere to improve healthcare everywhere Our Vision: Connected, empowered nurse leaders transforming global healthcare