Circular sign with a red border and diagonal slash, featuring a black silhouette of a hand holding a smartphone at the center. The design indicates a prohibition on cellphone use. The red circle is universally recognized as a symbol for restriction or prohibition. The contrast between the black silhouette and the white background emphasizes the message, making it easily noticeable in various settings. Typically used in places where cellphone usage is restricted, such as libraries or performance venues.
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