A magic square in which the elements in each corner have the same sum. Dürer's magic square, illustrated above, is an example of a gnomon magic square since the sums in any of the four quadrants (as well as the sum of the middle four numbers) are all 34 (Hunter and Madachy 1975, p. 24).
Gnomon Magic Square
See also
Dürer's Magic Square, Magic SquareExplore with Wolfram|Alpha
References
Hunter, J. A. H. and Madachy, J. S. Mathematical Diversions. New York: Dover, 1975.Stapleton, H. E. "The Gnomon as a Possible Link between (a) One Type of Mesopotamian Ziggurat and (b) the Magic Square Numbers on Which Jaribian Alchemy Was Based." Ambix: J. Soc. Study Alchemy and Early Chem. 6, 1-9, 1957-1958.Referenced on Wolfram|Alpha
Gnomon Magic SquareCite this as:
Weisstein, Eric W. "Gnomon Magic Square." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/GnomonMagicSquare.html