A graphical plot which can be used for solving certain types of equations.
References
Iyanaga, S. and Kawada, Y. (Eds.). ``Nomograms.'' §282 in
Encyclopedic Dictionary of Mathematics. Cambridge, MA: MIT Press, pp. 891-893, 1980.
Menzel, D. (Ed.). Fundamental Formulas of Physics, Vol. 1. New York: Dover, p. 141, 1960.