The wagging finger emoji is the universal symbol for “don’t do that.” Use 🚫👆 when calling out bad behavior in group chats or Slack threads, and try 👀👆 for a more subtle “watch yourself” in DMs. The combo 👆❌📚 nails the vibe of a stern teacher or a strict editor, while 👆🚷 warns against no-go zones or forbidden moves. It’s all about setting boundaries with style.