Sigma Kappa (ΣΚ, also known as SK or Sig Kap) is a sorority founded on November 9, 1874 at Colby College in Waterville, Maine. In 1874, Sigma Kappa was founded by five women: Mary Caffrey Low Carver, Elizabeth Gorham Hoag, Ida Mabel Fuller Pierce, Frances Elliott Mann Hall and Louise Helen Coburn. The sorority has initiated 172,000 members, has 122 collegiate chapters, and has over 110 alumnae chapters. It is officially partnered with the Maine Sea Coast Mission to raise money for the Mission's programs, and it also includes gerontology with an emphasis on Alzheimer's disease and research its other initiatives.