An ideogram or ideograph (from Greek ἰδέα idea "idea" + γράφω grafo "to write") is a graphic symbol that represents an idea or concept. Some ideograms are comprehensible only by familiarity with prior convention; others convey their meaning through pictorial resemblance to a physical object, and thus may also be referred to as pictograms.
Examples of ideograms include wayfinding signs, 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 formal languages (mathematical notation, logic, UML), which are used worldwide regardless of how they are pronounced in different languages. Other examples include the Blissymbols, Nsibidi, used by the Igbo and Ekpe in West Africa, Emoticons and pictographs as used by the Sioux and Ojibwa
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