It would be the square root key. (√) `it is not on the keyboard
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On some calculators, you type the number, followed by the square-root key. On others, especially the more modern ones, you press the square root key, followed by the number, then you press the "equal" key to get the result.
On most calculator there's a 'ENG' key
On some calculators, you press the number, then you press the key for square root. On other calculators - the more modern ones - there is a more natural input: you press the key for square root, then the number, and finally the equal sign to indicate you won't add anything else to the calculation.
On older calculators you would first have to calculate the log (press the log key), then press the square root key. More recent calculators usually allow you to do the input in the natural order, for example (if your number is 100), sqrt(log(100)).
To use the root button on a scientific calculator, first type the number you want to find the root of. Then, press the root button, which is usually denoted by a √ symbol. Finally, enter the index of the root, such as 2 for a square root or 3 for a cube root, and press equals (=) to get the result.