Definition - A character that symbolizes the idea of a thing, but which gives no indication of how it should be pronounced.

1. They are also called ideographs.

Example -
@, #, $, %, &, 2, 9, and 0

Etymology -
The word derives from the Greek idea, form + gram, something written.

Oxford English Dictionary -
Its first citation is from 1838:
"Nor was Dr. Young less successful with the hieroglyphic ideograms (or symbolic characters direct and indirect), many of which he determined.'
(Hincks in Blackwoods Magazine July 106/2)

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