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In page 1948 Summer Olympics:

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Olympic pictograms were introduced for the first time. There were twenty of them—one for each Olympic sport and three separate pictograms for the arts competition, the opening ceremony and the closing ceremony. They were called "Olympic symbols" and intended for use on tickets. The background of each pictogram resembled an escutcheon.[3][4] Olympic pictograms appeared again 16 years later, and were used at all subsequent Summer Olympics.[citation needed]