What does CUBErt mean?

This looks like you are asking what does "cube root" mean. The cube root of one number is a second number which, when multiplied by itself three times, will bring you back to the first number. The cube root of 27 is 3. This is because 3 x 3 = 9, and 9 x 3 = 27. Similarly, the cube root of 1331 is 11 - as 11 x 11 =121 and 121 x 11 = 1331.