 Probability mass

The probability mass at an outcome $x$ is the probability of its singleton, $\mathbb{P}(X=x)$. It equals the jump $F_X(x)-F_X(x^{-})$ of the cumulative distribution function. For a discrete probability distribution these masses form the probability mass function; a continuous probability distribution gives every individual outcome mass zero. Positive probability mass at a point is distinct from the height of a probability density function.