An integer is one of the numbers ..., -2, -1, 0, 1, 2, ....
algebraic integer | almost integer | complex number | counting number | cyclotomic integer | Eisenstein integer | fractional part | Gaussian integer | integer part | N | natural number | negative integer | nonnegative integer | nonpositive integer | positive integer | radical integer | real number | whole number | Z | Z^- | zero | Z^+ | Z^*
elementary school level (California grade 5 standard)