logogram,
logograph a single written symbol that represents an entire word or phrase without indicating its pronunciation; "7 is a logogram that is pronounced `seven' in English and `nanatsu' in Japanese"
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Wiktionary
Substantiv
ideogram -
A symbol which represents the idea of something without indicating the sequence of sounds used to pronounce it. Examples include numerals, many Chinese characters, traffic signs, or graphic symbols such as & and @.
Wikipedia
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, which are used worldwide regardless of how they are pronounced in different languages.