Generally signified with the expression: X^(1/2)
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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.
The square root symbol (√) was first used in 1525, by Christoph Rudolff, and is called a radical.