The symbol for things to avoid in biology: ☣️
The symbol for things to avoid in physics: ☢️
The symbol for things to avoid in IT: ✨

Also, avoid the 🚀. It's used by scum.

Any of them really. Emoji are for when you want to be visual or express an emotion but you don't care enough for professional writing. This is normal for direct messages and letters even in a professional setting, but really alarming for any mass communication from a substantial company which could reasonably contract a copywriter if no one in the existing team trusts their language skills.

I only communicate in vague ⛷️

@lorentz I don't trust the end user to be able to comprehend any such messages

Instructions unclear, 🍆 stuck in 🍑.