To apply the Optional Sampling Theorem we introduced a stopping time: the first time the martingale exits the interval, which is measurable with respect to the filtration and almost surely finite.

In advanced probability theory, stopping times often determine when to evaluate a stochastic process.

When she saw the painting, she stopped short at its unexpected likeness to her grandmother.

During the breaking-news meeting, she insisted on stopping the presses to correct the headline.

When the editor discovers the factual error, she stops the presses to correct the headline before distribution.

When the editor realized the headline was false, he stopped the presses to avoid spreading misinformation.

At busy intersections, turn stops help organize traffic and prevent accidents.

T-stopping on the crowded ice rink, she slowed down gracefully to avoid a collision.

The driver T-stopped at the junction to avoid colliding with the oncoming car.

Several ground stops were issued yesterday due to severe thunderstorms, causing widespread flight delays.