Science labs, particularly chemistry labs, have a lot of safety signs. This is a collection of public domain images you can use to learn what the different symbols mean or to construct signs for your own lab.
|Harmful or Irritant||Flammable||Explosives||Oxidizing|
|Corrosive||Environmental Hazard||Respiratory Protection Sign||Gloves Required Symbol|
|Eye or Face Protection Symbol||Protective Clothing Sign||Protective Footwear Sign||Eye Protection Required Sign|