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• Signs. These are any drawings, gestures and symbols which inform the public about certain things.
• Sirens. This is a device which is used to produce a loud shrill sound and may be accompanied by a flashing light.
• Photographs. This conveys the message by using an image of an object as it appears at the time of taking the photo.
• Television. This conveys the message in form of a series of images on a screen accompanied by a sound.
skilled writter answered the question on May 5, 2018 at 14:36
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