______Pi Tau Sigma is the National Honorary Mechanical Engineering Society and is a member of the Association of College Honor Societies. The official colors of Pi Tau Sigma are murray and azure and the official flower is a white rose. The concept of Pi Tau Sigma was initiated simultaneously at both the University of Illinois and the University of Wisconsin in 1915. Pi Tau Sigma was formed in 1916 by these two schools. Today their are over 140 different active chapters at different universities in almost every state of the United States.