#### Answer

As we know the real number contains a whole of the Mathematics inbuilt in himself.
The line has two moves , first from origin to right side and second from origin to left side.
Real numbers are vary from (- inf , inf ) .
All the number between real line like irrational number , rational number , whole number , natural numbers are contains automatically in it.
Mean that the real line containing all these numbers.

#### Work Step by Step

On the real number line, the origin is the point where the real number $0$ is located.
Thus, the answer is $\bf{\text{origin}}$.