While the 🚫 (Prohibited) emoji means a general 'no,' the ⛔ emoji is focused on forbidding the act of 'passing' or 'entering' itself. This makes it clearer for indicating a lack of access.

In online chats, it's used playfully to shut down a topic, like "Let's not talk about that anymore ⛔," or to represent a blocked path in a game. It's also useful when you don't want your personal space or time to be disturbed.