the story behind the radical sign

Did you ever wonder what is the origin of the radical sign?

The radical is long been used in the world

The oldest proof of usage of square root is this artefact found in today Iraq and it shows radical of 2

     Many scholars believes it was originated from the deformation of letter “r” the first letter of radical but other believes it is a deformation of the Arabic letter” ج” which is the first letter of the Arabic word” جذر”that means root in Arabic , the symbol was written like this √ 2  or √5.