Which signal word indicates the highest level of acute toxicity?

The signal word that indicates the highest level of acute toxicity is "Danger." This classification is part of the labeling guidelines established by the Environmental Protection Agency (EPA) for pesticide products. "Danger" signifies that the product has a high potential to cause harm or injury if it is not handled properly. It is associated with substances that can cause severe or irreversible harm upon exposure.

In contrast, "Caution" indicates a lower level of toxicity, implying that the product poses a less significant risk and is generally safer to handle. "Warning," while denoting a moderate level of toxicity, is also not as severe as "Danger." The phrase "Keep out of reach of children," while important for safety practices, does not classify the product's toxicity level and is more of a precautionary statement. Thus, understanding the implications of these signal words is crucial for recognizing the hazards associated with pesticide use.