Welcome! Chi Omega is the largest women’s fraternal organization in the world with 400,000+ Sisters The Rho Zeta Chapter of Chi Omega Sorority is located at East Carolina University in Greenville, North Carolina. The Chapter offers social and educational programs designed to enhance the college experience for its female members/students at the university. The organization promotes and supports the six foundational purposes of the national Cho Omega Sorority: Friendship, High Standards of Personnel, Sincere Learning and Creditable Scholarship, Participation in Campus Activities, Career Development, and Community Service.