Nachtwache
Nachtwache is a term that can refer to several things, most commonly a watchman or guard on duty during the night. In a historical context, nachtwache refers to the individuals responsible for patrolling streets and public spaces after dark to maintain order and deter crime. These night watchmen often carried lanterns and clubs, and their duties could include sounding alarms in case of fire or other emergencies. The concept of a nachtwache was prevalent in many European cities for centuries.
In art, the term "Nachtwache" is famously associated with Rembrandt van Rijn's masterpiece, "The Militia Company
More broadly, "Nachtwache" can also be used metaphorically to describe any entity or individual keeping vigil