Number Symbols Hub 10 Symbols
Number Symbols
Explore our complete math symbols list and interactive keyboard to lookup meanings, LaTeX codes, and UTF-8 characters for number symbols. Blackboard bold number sets (naturals, integers, rationals, reals, complexes) and universal constants.
Number Symbols Table & Meanings
| Action | Symbol | Name | Meaning | Example | LaTeX | Unicode |
|---|---|---|---|---|---|---|
| ℕ | Natural Numbers | Set of positive counting integers: {1, 2, 3, 4, ...} (or {0, 1, 2, ...}). | {1, 2, 3, ...} ⊆ ℕ | \mathbb{N} | U+2115 | |
| ℤ | Integers (Zahlen) | Set of all whole numbers: positive, negative, and zero {..., −2, −1, 0, 1, 2, ...}. | −7 ∈ ℤ | \mathbb{Z} | U+2124 | |
| ℚ | Rational Numbers (Quotients) | Set of numbers expressible as a fraction a/b where a, b ∈ ℤ and b ≠ 0. | 3/4 ∈ ℚ, 0.333... ∈ ℚ | \mathbb{Q} | U+211A | |
| ℝ | Real Numbers | Set of all points on the continuous number line, including rationals and irrationals. | √2 ∈ ℝ, π ∈ ℝ | \mathbb{R} | U+211D | |
| ℂ | Complex Numbers | Set of numbers of the form a + bi, where a, b ∈ ℝ and i = √−1. | 3 + 4i ∈ ℂ | \mathbb{C} | U+2102 | |
| ℙ | Prime Numbers Set | Set of natural numbers greater than 1 having exactly two factors (1 and itself). | ℙ = {2, 3, 5, 7, 11, ...} | \mathbb{P} | U+2119 | |
| e | Euler's Number (e) | Base of natural logarithms, mathematical constant ≈ 2.718281828... | e^{i\pi} + 1 = 0 | e | U+0065 | |
| i | Imaginary Unit | Unit imaginary number satisfying i² = −1. | i = √−1 ⟹ i² = −1 | i | U+0069 | |
| ∞ | Infinity | Concept representing boundless, unbounded quantity larger than any real number. | lim_{x → ∞} 1/x = 0 | \infty | U+221E | |
| φ | Golden Ratio (Phi) | Golden ratio constant equal to (1 + √5) / 2 ≈ 1.6180339887... | φ = (1 + √5)/2 | \phi \text{ or } \varphi | U+03C6 |
Number Symbols FAQ
What are the standard blackboard bold number set symbols (ℕ, ℤ, ℚ, ℝ, ℂ)?
ℕ denotes Natural numbers {0, 1, 2, ...}, ℤ denotes Integers {..., -2, -1, 0, 1, 2, ...}, ℚ denotes Rational numbers (fractions), ℝ denotes Real numbers, and ℂ denotes Complex numbers (a + bi).
How do I type blackboard bold letters in LaTeX?
Use the \mathbb{} command from the amssymb package (e.g. \mathbb{R}, \mathbb{N}, \mathbb{Z}, \mathbb{C}).