What signal word must highly toxic products carry?

Highly toxic products must carry the signal word "DANGER" to clearly indicate the level of toxicity and the potential risk they pose to human health and safety. This word is designated for substances that can cause severe harm or even death if ingested, inhaled, or come into contact with skin. The distinction is important as it conveys an urgent warning about the immediate dangers associated with the product, ensuring that users handle it with the utmost care and awareness. In contrast, the other terms such as "WARNING" and "CAUTION" are used for products that have lesser degrees of toxicity or risks, making "DANGER" essential for highlighting the most hazardous materials in the realm of pest control and other chemical applications.