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Comment by towledev

6 hours ago

Is it though? All languages have the word 'nothing'.

Better candidates: a) place-value numbering aka the positional numeral system, b) the Cartesian coordinate system. Forced to choose, I would pick (b).

"nothing" is not the same the same as "zero". "zero apples" means something different to "nothing", but that difference is subtle and difficult to explain, which is what makes the invention of zero such an achievement.