The colors of Tau Beta Pi are seal brown and white, which are the school colors of Lehigh. The official badge, called the Bent, is a watch key in the shape of the bent of a trestle (see picture). The trestle is the load-bearing part of the bridge, representing Tau Beta Pi's principle of Integrity and Excellence In Engineering. Originally, the keys could be used to wind watches. However, because watches have since been fabricated with their own winding mechanisms, modern keys do not have this ability. When using the Bent, members must adhere to strict guidelines regarding the exact dimensions of the trestle in order for the Bent to be a valid representation. The symbols on the Bent at the top and the bottom are an ancient form of Greek letters. The quarterly magazine of Tau Beta Pi is also titled "The Bent".