# Who introduced the symbol $\sqrt {x}$?

The question is already in the title.
I am interested in who was the first to introduce the symbol $\sqrt {.}$
I was asked this question from one of my students -since as he said the symbol is bizarre-
If it is possible I would also like to see other notations that have been used for square roots through time. Thanks in advance!

• This question is answered here hsm.stackexchange.com/questions/2264/… The radix symbol, without the overbar, was first used by Rudolff in 1525, the overbar was added by Descartes in La Geometrie (1637). – Conifold Oct 21 '15 at 18:58