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A hyphen is not a dash. Hyphens are used within words or to join words, but not in punctuating the parts of a sentence. Use an en dash (–) with before and a space after; or use an em dash (—) without spaces. See Wikipedia:How to make dashes. Avoid using two hyphens (--) to make a dash; and avoid using a hyphen for a minus sign. read ...
The space before a spaced dash should preferably be a non-breaking space ( ). Em dashes are not spaced. Dashes have the following uses: Unspaced em dashes or spaced en dashes are used to indicate interruption in a sentence. In this use, on any one page, either use unspaced em dashes consistently, or use spaced en dashes consistently.
The dash is a punctuation mark consisting of a long horizontal line. It is similar in appearance to the hyphen but is longer and sometimes higher from the baseline.The most common versions are the en dash –, generally longer than the hyphen but shorter than the minus sign; the em dash —, longer than either the en dash or the minus sign; and the horizontal bar —, whose length varies ...
The manual clearly places an emphasis on the use of white space to create a pleasing document by noting spacing rules that differ from current norms such as the use of two spaces before opening a parenthesis, after closing quotation marks, and after opening single quotation marks inside of sentences. [54]
The second is a link to the article that details that symbol, using its Unicode standard name or common alias. (Holding the mouse pointer on the hyperlink will pop up a summary of the symbol's function.); The third gives symbols listed elsewhere in the table that are similar to it in meaning or appearance, or that may be confused with it;
In HTML plain text, the proper minus sign (−) should be used, and this can be produced using the HTML code −. In certain writing styles, minus signs are represented using an en dash (–) instead of the proper minus sign (−) or a hyphen (-). However, this practice is not followed in Wikipedia.
Use a colon (spaced) when one or more decimal points is present (a 3.5 : 1 ratio (markup: a 3.5 : 1 ratio)). Do not use the colon form where units are involved (dissolve using a 3 ml : 1 g ratio)—instead see ratios section of table at § Unit names and symbols, below.
Ranges expressed using prepositions (from 450 to 500 people or between 450 and 500 people) should not use dashes (not from 450–500 people or between 450–500 people). Number ranges must be spelled out if they involve a negative value or might be misconstrued as a subtraction (−10 to 10, not −10–10). Agree.