What is a characteristic of the Category B hazard label?

The characteristic of the Category B hazard label that makes it identifiable is its inclusion of the UN3373 identifier at the center. This code is specifically designated for biological substances that present a low risk to individual health and the environment during transport. The UN number is essential in the transportation of dangerous goods as it communicates vital information about the materials being transported, allowing for appropriate safety measures to be employed by handlers and emergency responders.

The other options do not accurately reflect the defining features of a Category B label. For instance, the shape of the label is not circular; it typically follows a rectangular design. Similarly, the color of the label is not red; it uses a white background with a specific orientation of symbols. Lastly, while the label does convey information about hazardous materials, it does not depict an image of the materials. Instead, it focuses on standardized symbols and identifiers to convey the necessary warnings.