In mathematics, radical signs are, sqrt ,  root3 , root4..... When any number appears under these signs, the expression as a whole is called a radical
In mathematics, radical signs are, like sqrt ,  root3 , root4..... When any number appears under these signs, that is called a radicand and the expression as a whole is called a radical. This is what the radical form means. These are all irrational numbers, which means they cannot be expressed as a fraction in the form $\frac{p}{q}$ where p and q are integers.