The letters E X are not the Sigma Chi letters from the local chapter located behind CSAS. No one associated with UTC Fraternities would have made that mistake considering that half of the fraternities have a Sigma in the title. ex-Sigma Kappa, Kappa Sigma, Sigma Gamma Rho, Delta Sigma Theta, Phi Beta Sigma, & Sigma Chi. Whoever did this used what they saw as a motivator.