Number sets such as natural numbers (\mathbb{N}) It doesn't mean that LaTeX doesn't know those sets, or more importantly their symbols.

You need to define what symbol you want to use. One option would be something like this: enter image description here. Code: \documentclass{article}.

LaTeX symbols have either names (denoted by backslash) or special characters. They are Letters are rendered in italic font; numbers are upright / roman.

1 nano-; 2 Set of Natural Numbers; 3 Set of Non-Zero Natural Numbers; 4 Initial Segment of Natural Numbers; 5 North. 5.1 North (Terrestrial).

Just a note: One normally represents the sets of natural numbers, integers, rational numbers, real numbers, and complex numbers by bold.