Pattern wiki:
[he martial arts related meaning of Pattern see Tae Kwon Do and Kata (Karate).A pattern is a form, template, or model (or, more abstractly, a set of rules) which can be used to make or to generate things or parts of a thing, especially if the things that are generated have enough in common for the underlying pattern to be inferred or discerned, in which case the things are said to exhibit the pattern. Pattern matching is the act of checking for the presence of the constituents of a pattern. The detection of underlying patterns is called pattern recognition.
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shield wiki:
>This article is about the defensive device. For other meanings of the word see shield (disambiguation) A shield is a protective device, meant to intercept attacks. The term often refers to a device that is held in the hand, as opposed to armour or a bullet proof vest. The oldest form of shield was a protection used to block attacks by hand weapons and missiles. Shields have varied greatly in construction over time and place. Sometimes shields were made of metal, but wood or animal hide construction was very much more common; wicker and even turtle shells have been used. Many surviving examples of metal shields are generally felt to be ceremonial rather than practical, for example the Yetholm-type shields of the bronze age or the iron age Battersea shield.
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