Neck knife
Encyclopedia
A Neck knife is a small fixed-blade knife which is carried by means of a "pendant rig", in which the knife is suspended from around one's neck, handle down, by either a length of paracord or, more commonly, a breakaway beaded or ball chain
Ball chain
A ball chain is a type of chain consisting of small metal balls connected together via short lengths of wire.The balls are hollow and have two small antipodal holes. These holes accept a short length of wire deformed on the end like a rivet so that the end is bound inside the ball. The wire is...

 such as those utilized for military dog tag
Dog tag (identifier)
A dog tag is the informal name for the identification tags worn by military personnel, named such as it bears resemblance to actual dog tags. The tag is primarily used for the identification of dead and wounded and essential basic medical information for the treatment of the latter, such as blood...

s. Neck is an acronym for "no-nonsense emergency compact knife."

The knife stays in place by means of a form-fitting synthetic sheath, which holds it securely in place until yanked sharply. Some manufacturers prefer a looser fitting sheath augmented with magnets.

Neck knives are usually single-edged, with blade lengths typically under 4" -- and frequently less than 3". They are primarily intended for utilitarian use, although non-utilitarian versions (i.e., dagger
Dagger
A dagger is a fighting knife with a sharp point designed or capable of being used as a thrusting or stabbing weapon. The design dates to human prehistory, and daggers have been used throughout human experience to the modern day in close combat confrontations...

s and T-handled push dagger
Push dagger
A push dagger is a short-bladed dagger with a "T" handle designed to be grasped in the hand so that the blade protrudes from the front of one's fist, typically between the 2nd and 3rd finger...

s) also exist.

Neck knives are most frequently worn around the neck, but may be suspended from under the arm as well. They are sometimes worn under one's shirt for concealment, although this makes a quick draw nearly impossible, and even simple retrieval for utility purposes awkward. They are more frequently worn outside of a shirt. Not only does this make drawing the knife far easier, but it also avoids legal issues in jurisdictions where concealed knives are regulated.
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