Integer

1. The following are integers: zero (0), any positive or negative whole number.
2. The set of all integers is denoted by the symbol ℤ.
3. The set of all positive integers is denoted by the symbol ℤ⁺. It does not include zero (0).
4. The set of all negative integers is denoted by the symbol ℤ^–. It does not include zero(0).