The document discusses different types of pain scales used to measure pain intensity or features in patients. It provides examples of pain scales for infants, children, and adults, including the Faces Pain Scale-Revised used for children, the FLACC scale used for children ages 2 months to 7 years, the Brief Pain Inventory used in clinical trials and research, and the Wong-Baker Faces Pain Rating Scale. Pain scales are based on self-report, observation, or physiology and aim to properly assess and communicate a patient's pain experience.