Normal saline solution, also known as isotonic saline solution, is a common solution that is used in medical fields such as intravenous therapy, wound cleaning and irrigation, and nasal rinse. It is a sterile solution that contains the same amount of salt concentration as the human body. However, there are some other synonyms that can be used for normal saline solution, such as physiological saline, 0.9% saline, and sodium chloride 0.9%. These terms describe the same solution, but may be used in different regions or different medical contexts. Overall, normal saline solution plays an important role in maintaining proper bodily functions and preserving health.