How many hazard warning signs are there?

There are typically nine main categories of hazard warning signs, each represented by specific symbols and colors. These categories include signs for health hazards, physical hazards, environmental hazards, and more. The exact number of distinct hazard warning signs can vary by country and regulatory agency, as different standards may apply. For example, the Globally Harmonized System (GHS) identifies numerous specific hazard symbols, while other systems may have their own variations.