Pattern language
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In its most broadest sense, pattern language is used to mean a system of patterns that are able to be interpreted to have meaning other than just the pattern. It can be a pattern which is observed through any combination or single sense: most commonly including sight, sound, and touch, however may also include taste and smell.
Sight
The most obvious form of sight-based pattern language comes in the form of writing. Nearly every language has a unique written form, which grammatically follows the spoken form.