nomogram
Concise Oxford English Dictionary © 2008 Oxford University Press:
nomogram /ˈnɒməgram, ˈnəʊm-/ (also nomograph)
▶noun a diagram representing the relations between three or more variable quantities by means of a number of scales, so arranged that the value of one variable can be found geometrically.
– derivatives
nomographic adjective,
nomographically adverb,
nomography /nəˈmɒgrəfi/ noun.
nomographic adjective,
nomographically adverb,
nomography /nəˈmɒgrəfi/ noun.
'nomogram' also found in these Oxford entries:

