In 1909, TKE approached the Chi Rho Sigma Fraternity at Millikin University. There were no national fraternities at Millikin at this time, and TKE had just established its intentions to become a national fraternity. Representatives from TKE presented their case, and after thorough consideration, Chi Rho Sigma voted to accept TKE's offer. On April 17, 1909, Chi Rho Sigma was installed as the Beta Chapter of TKE. In November 1911, the Beta Rho Delta Fraternity was founded at the University of Illinois. ΒΡΔ petitioned Tau Kappa Epsilon in January 1912, and they were installed as the Gamma Chapter of TKE on February 3, 1912. Following the installation of the Gamma Chapter, "The Teke" magazine noted that the triangle was completed. The geographic location of TKE's first three chapters form a perfect equilateral triangle. The equilateral triangle was at that time, and continues to be, the primary symbol of Tau Kappa Epsilon.