Even though the term has a medieval origin, this kind of device was first described by Julius Caesar, in the seventh book of his Commentarii de Bello Gallico (Commentaries on the Gallic Wars).
Each trou de loup consists of a conical pit about 2 m (6 ft 7 in) deep and 1.2 to 2 m (3.9 to 6.6 ft) wide at the top. At the bottom of the pit, a sharpened Punji stick (wooden stake) is hammered in. In some cases, the pit is concealed by light cover of wicker and a layer of soil.
A mousetrap is a specialized type of animal trap designed primarily to catch mice; however, it may also (unintentionally) trap other small animals. Mousetraps are usually set in an indoor location where there is a suspected infestation of rodents. Larger traps are designed to catch other species of animals; such as rats, squirrels, other small rodents, or other animals.
Insect traps are used to monitor or directly reduce populations of insects or other arthropods. They typically use food, visual lures, chemical attractants and pheromones as bait and are installed so that they do not injure other animals or humans or result in residues in foods or feeds. Visual lures use light, bright colors and shapes to attract pests. Chemical attractants or pheromones may attract only a specific sex. Insect traps are sometimes used in pest management programs instead of pesticides but are more often used to look at seasonal and distributional patterns of pest occurrence. This information may then be used in other pest management approaches.
The trap mechanism or bait can vary widely. Flies and wasps are attracted by proteins. Mosquitoes and many other insects are attracted by bright colors, carbon dioxide, lactic acid, floral or fruity fragrances, warmth, moisture and pheromones. Synthetic attractants like methyl eugenol are very effective with tephritid flies.
A mantrap is a mechanical physical security devices for catching poachers and trespassers. They have taken many forms, the most usual being like a large foothold trap, the steel springs being armed with teeth which met in the victim's leg. Since 1827, they have been illegal in England, except in houses between sunset and sunrise as a defence against burglars
A booby trap is a device or setup that is intended to kill, harm or surprise a person, unknowingly triggered by the presence or actions of the victim. As the word trap implies, they sometimes have some form of bait designed to lure the victim towards it. At other times, the trap is set to act upon trespassers that violate personal or restricted areas. The device can be triggered when the victim performs some type of everyday action e.g. opening a door, picking something up or switching something on. They can also be triggered by vehicles driving along a road as in the case of improvised explosive devices (IED's).
A Penning trap is a device for the storage of charged particles using a homogeneous axial magnetic field and an inhomogeneous quadrupole electric field. This kind of trap is particularly well suited to precision measurements of properties of ions and stable subatomic particles. Geonium atoms have been created and studied this way, to measure the electron magnetic moment. Recently these traps have been used in the physical realization of quantum computation and quantum information processing by trapping qubits. Penning traps are used in many laboratories worldwide. For example, at CERN to store antimatter like antiprotons.
In law enforcement, a honey trap or sting operation is a deceptive operation designed to catch a person committing a crime. A typical honey trap will have a law-enforcement officer or cooperative member of the public play a role as criminal partner or potential victim and go along with a suspect's actions to gather evidence of the suspect's wrongdoing. Even mass media journalists resort to sting operations to record video and broadcast to expose illegal things.