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Punctuation might be considered the police special forces unit of written language. For language to maintain clarity and organization in its written form requires a system to be imposed on it, keeping it “in line” so to say. If someone took the time to take pen to paper (or digital tap to screen) we can assume that understanding and comprehension of those words is probably highly sought after. Send in the punctuation special forces.
As a designer/typographer it is important to understand this general purpose, their rules of engagement and their proper use. This practical knowledge can then be augmented by the close attention to size, shape, placement and spacing of the marks of punctuation—typography.