By mark for feet I assume you mean equivalent of cm or some such. If you were to describe my height in feet and inches I would be 6'4"
This means I am 6 foot 4 inches.
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The double mark after the 6 indicates inches. If it was a single mark (') - that would mean feet.
2 x 6 x 2 = 24 cubic feet
It means that you are six feet tall. If there is an apostrophe [ ' ] after a number when you are talking about height, it means feet, and a quotation mark [ " ] means inches.
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It is the single quotation mark. On the UK keyboard it is two to the right of L.