The symbol √ for the square root was first used in print in 1525 inChristoph Rudolff's Coss, which was also the first to use the then-new signs '+' and '-'
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The symbol used to indicate a nonnegative square root.
Leonhard Euler, an 18th Century mathematician, invented it. But the square root was used before him by the Greeks.
The 'radical': √
Usually, in code, the square root symbol is denoted as: sqrt() where the number inside the square root is written inside the brackets. For example, if you wanted the square root of 64, write: sqrt(64)