On: A Spectre Is Haunting Unicode (2018)

[_ph_]

N are the positive integers including zero, Z are all integers.

[dnautics → _ph_]

This is the math equivalent of tabs vs spaces

[Lvl999Noob → _ph_]

Isn't N just the positive integers and W the one with zero?

[a1369209993 → Lvl999Noob]

No, the positive intergers are Z⁺ (Z^+ / Z⁺). N is natural numbers aka nonnegative integers aka positive integers along with (not "including", since it isn't positive) zero.