What is pictograph

Pictograph is the way of expressing the data with the help of pictures. A key picture is used as unit which represents a number of concerned object. For example, the pictograph showing the numbers of cars sold by a company in different years is given below: 

Here, the key is "1 image of car = 1000 cars". 

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a pictorial symbol for a word or phrase. Pictographs were used as the earliest known form of writing, examples having been discovered in Egypt and Mesopotamia from before 3000 BC.
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