It means inverse, and performs the opposite of the given operation. For example, if you want inverse of tangent, you will use that inv button.
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The INV button is the same as the SHIFT button on the top left corner of the buttons (the leftmost button under the screen).
Yx
Press the simplify button.
If you have Windows 7, as do I, then change the calculator to scientific mode, and there is a cube roots button, type in the number you want, and hit that button. If you are talking about a standard handheld calculator, most don't have it, but the TI scientific ones do!
that maces no sens