In June 2015 the Occupational Health & Safety Administration announced their new
Hazard Communication Standard (HCS) program which would require the use of pictograms on labels to alert users to the hazards that they might be exposed to. Some examples of pictograms can be seen below.
For information on when and how to use pictograms in your workplace, read the OSHA Brief -- Hazard Communication Standard: Labels and Pictograms manual.