Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The prime symbol ( ), double prime symbol ( ), triple prime symbol ( ) etc. are used to designate several different units, and for various other purposes in mathematics, the sciences and linguistics. The prime symbol should not be confused with the apostrophe, single quotation mark, acute accent or grave accent; and the double prime should not be confused with the double quotation mark or the ditto mark. The prime symbol is commonly used to represent feet, arcminutes and sometimes minutes of time. The double prime represents inches, arcseconds and sometimes seconds of time. Thus, 3 5 could mean 3 feet and 5 inches ("three foot five"), or 3 minutes and 5 seconds (of time). As an angular measurement, 3° 5 30 means 3 degrees, 5 arcminutes and 30 arcseconds. In watchmaking the triple prime represents a ligne. Triple primes are occasionally found in 17th- and 18th-century astronomical works to denote tfrac{1}{60} of a second of arc.

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