Sergeant (abbreviated to Sgt and capitalised when used as a named person's title) is a rank in many uniformed organizations, principally military and policing forces. Its origin is the Latin serviens, "one who serves", through the French term sergent.
The term "sergeant" refers to a non-commissioned officer placed above the rank of a corporal and a police officer immediately below a lieutenant. In most armies the rank of sergeant corresponds to command of a squad (or section). In Commonwealth armies, it is a more senior rank, corresponding roughly to a platoon second-in-command. In the United States Army, sergeant is a more junior rank corresponding to a four-soldier fireteam leader.
More senior non-commissioned ranks are often variations on sergeant, for example staff sergeant, first sergeant and sergeant major.
Many countries use sergeant rank, whether in English or using a cognate with the same origin in another language. The equivalent rank in Arab armies is raqeeb, meaning "overseer" or "watcher".