Ideogram n. : An original, pictorial element of writing; a kind of hieroglyph expressing no sound, but only an idea.

Ideogram n. : A symbol used for convenience, or for abbreviation; as, 1, 2, 3, +, -, /, $, /, etc.

Ideogram n. : A phonetic symbol; a letter.

Example:
Saturn sc1 instrument Ideogram meanings?

Taxonomy
Ideogram, Chinese characters, Languages, free encyclopedia, Writing systems, Akkadian, ideograph, ideographic, icon, bull's head, ox, logograph, DeFrancis, University of Hawaii Press, pictograms, different languages, pictographs, the Sioux.

Defination from the web:
ideogram or ideograph (from Greek ἰδέα idea "idea" + γράφω grafo "to write") is a graphic symbol that represents an idea or concept. ... The term "ideogram" is commonly used to describe logographs in writing systems such as Egyptian hieroglyphs, Sumerian cuneiform and Chinese characters. ...