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Probability Symbols
Explore our complete math symbols list and interactive keyboard to lookup meanings, LaTeX codes, and UTF-8 characters for probability symbols. Notations for event probabilities, conditional probability, expectations, variances, sample spaces, and distributions.
Probability Symbols Reference Table
| Action | Symbol | Name | Meaning | Example | LaTeX | Unicode |
|---|---|---|---|---|---|---|
| P(A) | Probability of Event A | The likelihood of event A occurring, ranging between 0 and 1 inclusive. | P(\text{Heads}) = 0.5 | P(A) \text{ or } \mathbb{P}(A) | U+0050 | |
| P(A|B) | Conditional Probability | Probability of event A occurring given that event B has already occurred. | P(A|B) = P(A ∩ B) / P(B) | P(A \mid B) | U+2223 | |
| E(X) | Expected Value | Long-run average value of repetitions of the random variable X. | E(X) = ∑ x_i P(X = x_i) | \mathbb{E}[X] \text{ or } E(X) | U+0045 | |
| Var(X) | Variance | Measure of the dispersion of a random variable from its mean: E[(X − E[X])²]. | Var(X) = E(X²) − (E(X))² | \operatorname{Var}(X) | U+0056 | |
| Cov(X,Y) | Covariance | Joint variability of two random variables X and Y. | Cov(X, Y) = E[(X − μ_X)(Y − μ_Y)] | \operatorname{Cov}(X,Y) | U+0043 | |
| ∼ | Distributed As (∼) | Indicates that random variable X follows distribution D (e.g., X ∼ N(μ, σ²)). | X \sim \mathcal{N}(0, 1) | \sim | U+223C |