The most mysterious and complex number. Basically zero is nothing and something at the same time. Then less than zero is written -1 this totally contradicts the whole number.
The number 0 exists and then yet it represents that something doesn'texist!
"0" or "Zero" is normally seen as "nothing", but "0" refers specifically to having "0" amount of something as a value, as opposed to "nothing" which refers to the non-existence of something, whether it's a quantity or not.
The symbol of "0" is resemblant of the letter "O" but taller and thinner, for this reason, when used digitally it is common for an alternate version of this symbol with a diagonal line from bottom left to top right of the shape to be used, for it not to be confused with the letter "O".