A punctuation symbol similar to an apostrophe or a single quotation mark. Example: 5′ means 5 prime.
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The symbol for inches is represented by a double prime (″) or a single quote (') in some contexts, particularly when distinguishing feet from inches. However, the more common symbol specifically for inches is the double prime (″). For example, 5 inches can be written as 5″.
The symbol for feet is one apostrophe, as in 15 feet = 15' The symbol for inches is two apostrophes, as in 15 inches = 15"
Feet are usually written as ', and the symbol is also used to denote arcminutes. Prime units of any type will also be marked in such a manner, as are minutes of angle and time.
Yes, the "prime" symbol (')can be used to denote minutes. The prime symbol looks similar to an apostrophe, but is a straight line. So, 10 minutes would be written as 10'. You didn't ask, but the double prime symbol can be used to denote seconds, as in 10".
Square feet don't have prime factors.