Which signal word is associated with very low oral LD50 values?

The signal word "Danger-Poison" is associated with very low oral LD50 values, indicating a high level of toxicity. LD50, or lethal dose for 50% of the test population, is a standard measure used to evaluate the toxicity of a substance. When a pesticide has a very low oral LD50 value, it means that only a small amount of the substance is required to cause death in half of the test subjects, highlighting its dangerous nature.

The use of "Danger-Poison" as a signal word alerts users to the extreme risk associated with handling or using the pesticide. This designation is critical in promoting safety measures and awareness among pesticide applicators and handlers, as improper use could lead to severe health risks or fatalities.

In contrast, other signal words such as "Warning" or "Caution" denote lower toxicity levels and represent substances that require careful handling but do not pose the same immediate and acute risks as those labeled with "Danger-Poison." The term "Safe" does not apply in this context, as it would suggest that the pesticide poses negligible risk, which is not the case with products that have very low oral LD50 values.