What is the primary purpose of the signal word on a pesticide label?

The primary purpose of the signal word on a pesticide label is to indicate the product's relative acute toxicity to humans and animals. Signal words such as "Danger," "Warning," and "Caution" provide essential information regarding the potential hazards of the pesticide. This classification helps users quickly assess the level of risk associated with handling or applying the product. Understanding the toxicity level is crucial for ensuring proper safety measures are taken during use, thereby protecting the applicator, bystanders, and the environment. This understanding can inform users about the appropriate precautions to take, such as wearing protective gear, ensuring good ventilation, or following specific application guidelines to mitigate risk.