What is the relationship between the number set in mathematics

What is the relationship between the number set in mathematics

What is the relationship between the set of numbers in mathematics? What is the problem? Does it mean the following:
N ≤ Z ≤ Q ≤ R ≤ C, (sorry, can't find the containing symbol, use ≤ instead)
Here, from left to right, the letters above represent natural number set, integer set, rational number set, real number set and complex number set