The square root symbol (√) was first used in 1525, by Christoph Rudolff, and is called a radical.
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The square root symbol is like a tick with a line connected to the top. Go to http://en.wikipedia.org/wiki/Square_root and the square root symbol is displayed.
If unspecified, the square root is the principal root, which is the positive root.
To type the square root symbol on ypur keyboard press and hold alt and type 251.
It is the RADICAL SIGN , its definition is - the symbol used to indicate a nonnegitive square root.
Original Answer: There are a variety of ways. LEt's look at how you would say Square Root of 25. SQRT(25) 25^0.5 25 Improved Answer: The square root symbol did not come through around the 25 in the above answer. Go to Google and enter Square Root Symbol in the search.