ℝ: set name, real numbers, ℂ : set-builder notation, { a + bi : a, b ∈ ℝ}, ℂ : set name, complex numbers, ℚ : set name, rational numbers, ℚ : set-builder notation, { p/q : p, q ∈ ℤ and q ≠ 0 } , ℤ : set name, integers, ℤ : set of elements, { ..., -2, -1, 0, 1, 2, ... }, ℤ : set builder notation , { ± n : n ∈ ℕ } ∪ { 0 }, ℕ : set of elements, { 1, 2, 3, 4, ... }, ℕ : set name, natural numbers, ∅ : set name, empty set, ∅ : set elements, { }.

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