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Blackboard bold used on a blackboard . Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, and the derived style of typeface used in printed mathematical texts.
The blackboard bold typeface is widely used for denoting the basic number systems. These systems are often also denoted by the corresponding uppercase bold letter. A clear advantage of blackboard bold is that these symbols cannot be confused with anything else. This allows using them in any area of mathematics, without having to recall their ...
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By contrast, a bold font weight makes letters of a text thicker than the surrounding text. [2] Bold strongly stands out from regular text, and is often used to highlight keywords important to the text's content.
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Bold type is reserved for certain uses. Quotation marks for emphasis of a single word or phrase are incorrect, and " scare quotes " are discouraged. Quotation marks are to show that you are using the correct word as quoted from the original source.