Triangle Fraternity was founded in 1907 by sixteen engineers at the University of Illinois.  From the start, it was meant to be a place where men of similar majors could socialize, support each other’s academic pursuits and better prepare themselves for successful careers. 

Since that time, our membership has grown and expanded to include mathematics and the physical sciences as well as architecture, making us STEM long before the term was coined in 2001.  Today, we continue to provide a unique social, academic and professional experience for STEM majors.


The Purpose of Triangle

The purpose of Triangle shall be to maintain a fraternity of engineers, architects, and scientists. It shall carry out its purpose by establishing chapters that develop balanced men who cultivate high moral character, foster lifelong friendships, and live their lives with integrity.


The Objectives of Triangle

To help develop the highest standards of personal integrity and character;

To foster and provide an intellectual, mature environment for its members through individual and group effort and through the mutual companionship of men with similar professional interests and goals;

To foster and provide the broadening experience of fraternity living with its social and moral challenges and responsibilities for the individual and the chapter;

To recognize and support the objectives and goals of the alma mater and those of the community through responsible participation and action;

To help bridge the gap between undergraduate study and the vocation of the individual in industry, the academic world or government;

To foster and maintain a bond of fraternal brotherhood through a continuing program of activity for the alumni, and;

To bring into focus the elements of planned progress for the betterment of mankind.


National Headquarters Address

120 S. Center Street
Plainfield, IN 46168
P | (317) 837-9640
F | (317) 837-9642

Office Hours

Monday through Friday
9 a.m. to 5 p.m. (Eastern)

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