If the clue is accurate it must be ideogram.
This from OED
idiogram. Cytology and Med.
[ad. Russ. idiogramma (S. Navashin: in Zhurn. Russk. Bot. Obshch. (1921) VI. 171 he is reported as having used the term in his lectures for many years): see idio- and -gram.]
= karyotype n. 1 b: usually, a diagrammatic or systematized representation of a chromosome complement (of one cell or of many) indicating the number of chromosomes, their relative lengths, the position of the centromeres, etc.
ideogram.
[f. Gr. ____ idea + -gram. Cf. mod.F. idéogramme.]
= ideograph. Also used in transf. senses, esp. of figurative diction.
ideograph. Also erron. ideagraph.
[f. as ideogram + -graph.]
A character or figure symbolizing the idea of a thing, without expressing the name of it, as the Chinese characters and most Egyptian hieroglyphics.