It is important to follow lab safety guidelines to prevent any damage to students or personnel. The lab safety symbol that states that something is harmful is the most important safety symbol. It is the most important symbol because it warns personnel about the dangers of something and it applies to anything dangerous not just something that might be corrosive or toxic or any specific dangerous material.
This is definitely an important safety symbol. We have to make sure that while we are doing experiments, we stay safe.
I agree with your statement that following all lab safety guidelines can help prevent the cause of any harm to students or yourself. I also agree that the lab safety symbol that shows that something is harmful because it warns us about the substance that we will be observing will be dangerous.