NS means saline, the main component is 0.9% sodium chloride solution, because saline is the same as the sodium ion and chloride ion in the human body’s extracellular fluid, so it can be infused quickly to expand the volume, such as when the human body is in shock or dehydration can be expanded. Also, saline can be used as a solvent for many drugs in the clinical treatment process, for example, when infusing antibiotics or other drugs, saline is used to dissolve the solution to make a 100ml solution or a 250ml solution for intravenous infusion. indicates the nervous system. If the neurological system is negative, it means that everything is normal, and if the neurological system is positive, this suggests the possibility of a positive Babinski’s sign, etc.