It indicates that something is banned or forbidden.
The best explanation for why this sign is so effective is that it indicates that something is banned or forbidden. When a sign is used to communicate that an action is prohibited or not allowed, it appeals to people's natural curiosity and sparks their attention. This is because humans are generally more attracted to forbidden or restricted things, as they tend to pique our interest and challenge our sense of curiosity. Therefore, when a sign clearly conveys that a certain action is prohibited, it immediately grabs people's attention and encourages them to adhere to the message conveyed by the sign. By understanding the concept of forbidden or restricted actions, we can predict human behavior and design effective signs to communicate with large audiences.
