90 degrees
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I believe that it's not called anything, it is just a symbol to indicate that the angle is a right angle (90 degrees)
The volume of the box is 160 cubic units.
The length of a box that measures 18 cm is approximately 7.1 inches.
2ft by 2ft
Half the contents of box A equals 12 x 12 x 6... which is 864 cubic centimetres !