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n.a transparent picture or photograph used with a projector; a rectangular board on which names are displayed, typically in a public place; a movement across a surface, often in a controlled manner; a transparent picture or photograph used with a projector; a rectangular board on which names are displayed, typically in a public place; a movement across a surface, often in a controlled manner; a transparent picture or photograph used with a projector; a rectangular board on which names are displayed, typically in a public place; a movement across a surface, often in a controlled manner; a transparent picture or photograph used with a projector; a rectangular board on which names are displayed, typically in a public place; a movement across a surface, often in a controlled manner