Prohibitory signs are visual indicators that communicate restrictions or rules to the public. They are commonly used in various settings, such as roads, parks, and buildings, to inform people about actions that are not allowed. These signs often feature a red circle with a diagonal line, symbolizing that a specific behavior is prohibited. Examples of prohibitory signs include "No Parking," "No Smoking," and "Do Not Enter." These signs help maintain safety and order by clearly conveying important information. By following these signs, individuals can contribute to a respectful and compliant environment for everyone.