Which of the following is not a signal word found on pesticide labels?

The correct answer is that "Attention" is not a signal word found on pesticide labels. Pesticide labels utilize standardized signal words to convey the level of toxicity and the potential risks associated with the product. These signal words serve an essential function in ensuring safety by informing users of the necessary precautions to take when handling or applying the pesticide.

The signal words "Warning," "Caution," and "Danger: Poison" are established categories that indicate the severity of potential hazards. "Caution" is used for products that are relatively low in toxicity, while "Warning" indicates a moderate level of toxicity. "Danger: Poison" signifies a highly toxic product that can cause serious injury or death. Each term is specifically included in pesticide labeling regulations to promote clarity and safety for users.

In contrast, "Attention" does not have a designation as a signal word in the context of pesticide labeling, making it the correct answer in this context.