The Phi Beta Kappa Society (ΦΒΚ) is the oldest academic honor society in the United States. It is often described as the most prestigious honor society in the United States, Phi Beta Kappa aims to promote and advocate excellence in the liberal arts and sciences and to induct the most outstanding students of arts and sciences at American colleges and universities. It was founded at the College of William and Mary on December 5, 1776 as the first collegiate Greek-letter fraternity and was among the earliest collegiate fraternal societies. - Source: Wikipedia