Brier score
A measure of how good a set of probability forecasts was; lower is better, zero is perfect.
For each forecast, the Brier score takes the squared difference between the stated probability and what happened (1 if it happened, 0 if not), then averages across all forecasts. Saying 90% for something that happens costs 0.01; saying 90% for something that does not costs 0.81.
It rewards both being right and being honest about uncertainty, which is why it is the standard for scoring probabilistic predictions such as podium and DNF probabilities.