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An em dash is a typographic dash that is supposed to be as wide as a lowercase "m" character. In other words, the en dash always stays with the characters immediately preceding it. If necessary, Word will break a line right after the en dash, not before it. You can also create it by holding down the Alt key as you type 0150 on the numeric keypad. You create an en dash by pressing Ctrl and the minus sign on the numeric keypad. These dashes are typically used to denote ranges of numbers, as in 3–7. An en dash is a typographic dash that is as wide as a lowercase "n" character. It is also helpful to use non-breaking hyphens in phone numbers. In this case, the compound word will never be broken over two lines.
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Non-breaking hyphens are used in compound words to indicate that both words and the hyphen should be treated as a single word when Word is forming lines. These are created by pressing Ctrl+Shift+- ( Ctrl+Shift and the hyphen key). The optional hyphen does not appear on any printout unless it is actually used at the end of a line. Optional hyphens are the type inserted automatically when you use the Hyphenation tool in Word. Optional hyphens are typically used in the middle of a word, between syllables, to indicate where a word should be broken between lines, if Word deems it necessary. These are created by pressing Ctrl+- ( Ctrl and the hyphen key). If a compound word appears near the end of a line, the second word will be displayed on the next line, if necessary, with the first word and hyphen remaining on the previous line. Regular hyphens are used to create compound words, such as "mix-up," or to indicate a minus sign in an equation.
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It is sometimes mistakenly called a dash key. This is the key that is to the right of the zero key on the keyboard. These are created by simply typing the hyphen key. It is important to understand how Word handles each of these, as they can affect the appearance of your document. Actually, it supports three types of hyphens and two types of dashes. Word supports the use of both hyphens and dashes.
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