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A shield is a piece of personal armour held in the hand or mounted on the wrist or forearm. Shields are used to intercept specific attacks, whether from close-ranged weaponry or projectiles such as arrows, by means of active blocks, instead of providing passive protection.
Depending on time and place, shields could be round, oval, square, rectangular, triangular, bilabial or scalloped. Sometimes they took on the form of kites or flatirons, or had rounded tops on a rectangular base with perhaps an eye-hole, to look through when used with combat. The shield was held by a central grip or by straps that went over or around the user's arm.
In the 20th and 21st century, shields have been used by military and police units that specialize in anti-terrorist actions, hostage rescue, riot control and siege-breaking. The modern term usually refers to a device that is held in the hand or attached to the arm, as opposed to an armored suit or a bullet-proof vest. Shields are also sometimes mounted on vehicle-mounted weapons to protect the operator. 2017-09-12
See the Wikipedia page for more information.