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Z
Integers
All positive and negative whole numbers.
N
Natural
Numbers used for counting (all positive integers).
R
Real
Includes all numbers on the number line.
Q
Rational
All real numbers which can be expressed as a fraction, p/q where p and q are integers and q≠0. All integers are rational numbers as 1 is a non-zero integer.
I
Irrational
All real numbers which can't be expressed as a fraction whose numerator and denominator are integers (i.e. all real numbers which aren't rational).
W
Whole
Whole numbers are the set of positive integers (1, 2, 3, ...) and zero (0). They do not include fractions, decimals, or negative numbers.