Chi Omega (, also known as ChiO) is a women's fraternity and a member of the National Panhellenic Conference, the umbrella organization of 26 women's fraternities. Chi Omega has 181 active collegiate chapters and approximately 240 alumnae chapters. Since its founding in 1895 at the University of Arkansas, the sorority has initiated over 355,000 members with more than 28,000 undergraduates added each year, making it the largest women's sorority organization by membership. Chi Omega's national headquarters are located in Memphis, Tennessee. History Chi Omega was founded April 5, 1895, at the University of Arkansas by Ina May Boles, Jean Vincenheller, Jobelle Holcombe, and Alice Simonds, with the help of Dr. Charles Richardson, an initiate of the Kappa Sigma fraternity. This founding chapter is called the Psi chapter. It first expanded in Fall 1898 with Chi chapter at Transylvania University; located in Lexington, Kentucky, and Hellmuth Ladies' College, located in London, Ontario. Both chapters were transferred to other schools in 1903. By its 10th anniversary, in 1905, and with the support of Alumnae and Dr. Richardson, Chi Omega had installed 17 chapters throughout the United States. Chi Omega joined the National Panhellenic Conference in 1903. From 1947 to 1973, Chi Omega's headquarters were in the private home of two alumnae in Cincinnati, Ohio. In 1973, Chi Omega moved to the 33rd floor of Carew Tower, the tallest building in Cincinnati. Chi Omega was the first women's Sorority to have an executive office in an office building. In 1986, the Chi Omega Executive Office was moved to the 31st floor of the same office building, Carew Tower, until their move to the present location in Memphis, Tennessee, in December 1993. In the late 1990s, the leadership in Chi Omega researched opportunities for a partnership with a national philanthropy, choosing the Make-A-Wish Foundation as their official philanthropy since 2002. Since the start of this alliance, Chi Omega has raised more than 19 million dollars and has volunteered over one million hours for Make-A-Wish and contributed more than a million dollars annually. Despite being a women's organization, Chi Omega only refers to itself as a women's fraternity instead of a sorority. As such, Chi Omega is the largest women's sorority organization in the world with over 355,000 initiates and 181 collegiate chapters. The 300,000th member was initiated in 2013. Symbols The white carnation is the official flower, while the skull and crossbones are the