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The signal word 'Caution' is associated with Category 3 pesticides. This category includes pesticides that are classified as having a relatively low toxicity compared to those in Categories 1 and 2. In terms of signal words, 'Caution' indicates that while there may be some degree of toxicity, the risk to humans and animals is minimal under proper handling and usage conditions.

Pesticides in Category 3 typically present a lower risk and are often considered safer for both users and the environment, leading to the use of 'Caution' on their labeling. This is important for users to understand, as it helps guide their safety measures and application practices when handling these products. The distinction in signal words between the various categories is essential in the regulatory framework for pesticide use, as it directly informs individuals about the nature and level of hazard associated with a product.