As per Robert Kaplan, the Harvard Mathematics Professor and the author of the book on Zero, “Zero is in your mind, however, not in the sensory world.” When we talk about the history of numbers in mathematics, zero is the relevant one which has the meaning of nothing however, to us, means everything as it is maybe the most utilized number in the mathematics curriculum.

https://www.edulyte.com/blog/importance-of-zero-in-mathematics/