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An ideogram or ideograph (from Greek ἰδέα idéa “idea” + γράφω gráphō “to write”) is a graphic symbol that represents an idea or concept.
Examples of ideograms include wayfinding signage, such as in airports and other environments where many people may not be familiar with the language of the place they are in, as well as Arabic numerals and mathematical notation, which are used worldwide regardless of how they are pronounced in different languages.
The term “ideogram” is commonly used to describe logographic writing systems such as Egyptian hieroglyphs and Chinese characters. However, symbols in logographic systems generally represent words or morphemes rather than pure ideas.
The icon that represents the meaning of the idea is represented by a light bulb. Even if the light bulb is in fact the representation of an object (a pictogram), it conveys the message of the idea, a concept (an ideogram).