Question

is {0} considered as a void set?

Answer 1

No, {0} is not considered as a void set as it contains one element that is 0.

A set that contains no element is called a null set.
It is represented by $\phi$.
$\mathrm{\phi }=\left\{\right\},\mathrm{represents}\mathrm{a}\mathrm{null}\mathrm{set}\mathrm{or}\mathrm{void}\mathrm{set}.$