Shelby's Iron Brigade Brigade. The 3rd Brigade Combat Team, 1st Infantry Division was known as the Iron Brigade from its formation in 1917 through World War I, World War II and Vietnam, until some time in the early 2000s when, for reasons that are still unclear, the name was changed to Duke Brigade. The unit crest was an Iron Cross in a triangle, it appears that that was also changed. The 3rd Brigade of the 4th Infantry Division is also known as the Iron Brigade. Its unit crest is similar to the medals issued to veterans of the both Western and the Eastern
Triangle center honor of Clark Kimberling who created the online encyclopedia of more than 9000 triangle centers, the triangle centers listed in the encyclopedia are collectively called "Kimberling centers". A triangle center P is called a "polynomial triangle center" if the trilinear coordinates of P can be expressed as polynomials in "a", "b" and "c". A triangle center P is called a "regular triangle point" if the trilinear coordinates of P can be expressed as polynomials in Δ, "a", "b" and "c", where Δ is the area of the triangle. A triangle center P is said to be a "major triangle center"