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Explanation:

Pictograms are digital images (or icons) that communicate a message through the pictorial resemblance to a physical object or an action.  Pictograms in the labeling system are very important because they help transmit a message with the image. If a label wants to transmit a message of warning, they would create a pictogram with a white background in a red diamond with the icon in the middle. One example could be the icon of a flame, transmitting that the object or substance is flammable, pyrophoric, or emits flammable gases.