system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why did Tobias Dantzig say the discovery of zero was “one of the single greatest achievements of the human race”?

To everyone today the number zero is an obvious and benign idea. Why did Dantzig (one of the GOAT mathematicians) think otherwise?
gpt
He meant the idea of using 0 in math, which isn't obvious. Most ancient culture never wrote 0 when they did math. In many cases, 0 can be avoided in arithmetic and geometry, but 0 is very important to modern math.

0 has a concept is as old as any other numbers.  Every language has a word for None which is the determinant for 0. It's just that for math, ancient cultures didn't know that it was useful.