Sergeant (Sgt or SGT) is a rank in many military and police forces.
1. In Military, a sergeant is any of the several Non-Commissioned Officer (NCO) of middle rank in the army, marines, or air force.
2. In American police forces, a sergeant is an officer ranking next below a captain or a lieutenant.
3. In the British police force, a sergeant is a police officer ranking just below an inspector.
from Old French sergent, from Latin serviēns, literally: one who serves