Nine labels used to identify hazardous materials in the Global Harmonization System (GHS). Top row: ...

Nine labels used to identify hazardous materials in the Global Harmonization System (GHS). Top row: explosive (left), flammable (middle), and oxidizer (right). Middle row: compressed gas (left), corrosive (middle), and poison (right). Bottom row: the cautionary symbol used for multiple hazards (left), the health hazard symbol used for such materials as carcinogens (middle), and environmental hazards (right). As a hazardous materials technician you will soon encounter these labels much more often as global harmonization becomes more widespread.