Which of the following is a type of signal word often found on labels?

The type of signal word often found on labels is "Warning." This term serves an important function in communication, particularly in labeling hazardous materials or products. The word "Warning" indicates a potential hazard that could lead to injury or adverse effects if the associated precautions are not followed. It alerts users to take necessary care and can help prevent accidents in both professional and everyday settings.

Other terms, while they may appear on labels, do not carry the same level of seriousness or established meaning regarding potential hazards. "Attention" might suggest the need for careful observation, but it lacks the specific implication of risk inherent in "Warning." "Care" and "Notice," similarly, don't indicate the risk of danger or injury. Instead, they might simply advise on general instructions or require the reader's awareness without the significant implication of potential harm.