It is the single quotation mark. On the UK keyboard it is two to the right of L.
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The delete symbol on a computer is : /
The symbol for feet is one apostrophe, as in 15 feet = 15' The symbol for inches is two apostrophes, as in 15 inches = 15"
See character code '0xD0' in the 'Symbol' font on a Windows computer.
ft W.C.
6' = 6 feet