It is a measure of volume in the Imperial system, a measurement system which is now obsolete in all but a few recalcitrant countries.
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it is 8 cubic feet
8' × 10' × 2" = 96" × 120" × 2" = 23040 cubic inches = 13⅓ cubic feet
One yard is 3 feet. Therefore a cubic yard is 9 cubic feet. 2 cubic yards will cover 18 cubic feet of stone.
There are: 3*2*5 = 30 cubic feet
It is about: 4/3*pi*2^3 = 33.5 cubic feet