What is this mysterious elevator instruction: 禁止追逐打闹 or "prohibition of chasing"?
First, don't be bothered by the icon. It will confuse you.

And you already know


  禁止追逐打闹


It is a compound phrase appearing in 禁止追逐和打闹. Usually the sign hangs against the wall in school as a reminder for students to keep themselves safe.

So just imagine what those playful kids do, and you will know what 追逐打闹 is.