It means to multiply it by itself. For example to square 3 you multiply 3 by 3 to get the answer 9. Square 4 and you get 16, square 5 and you get 25.
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I have a gold ring that has a square inside the band an it has a dot in the middle of square. What does it mean?
it means 64 square meters
The symbol of a square inside of a square for electrical purposes means double insulated.
If you mean 84 squared then it is 84*84 = 7056 If you mean the square root of 84 then it is 2 times the square root of 21 which is an irrational number
If you mean square ROOT of 81, 9.