nom·o·graph 
(n
ŏm
ə-gr
ăf
′, n
ōm
ə-) or
nom·o·gram (-gr
ăm
′)
n.1. A graph consisting of three coplanar curves, each graduated for a different variable so that a straight line cutting all three curves intersects the related values of each variable.
2. A chart representing numerical relationships.
[Greek nomos, law; see nem- in the Appendix of Indo-European roots + -GRAPH.]
nom′o·graphic adj.
no·mogra·phy (nō-mŏgrə-fē) n.