He grew up playing Aussie rules on the dusty fields behind his school.

When making quick decisions, managers often rely on rules of thumb rather than detailed analyses.

During the contentious divorce proceedings, the judge reluctantly applied the Hildebrand rules, allowing private letters between the spouses to be admitted as evidence.

Dühring's rule predicts a linear relationship between the temperatures at which two solutions exert the same vapor pressure, making it useful for estimating boiling points in mixed-solvent systems.

In a normal distribution, the empirical rule helps estimate the proportion of data that fall within one, two, and three standard deviations from the mean.

Before the audition, the organizers explained the selection rules to all candidates.

The ancient clan lived by strict blood rules that no outsider could question.

Many practitioners reminded the novices about the Rule of Three, warning them that any harm they caused would be returned to them threefold.

Many people on the internet jokingly invoke Rule 34 to explain why they keep finding unexpected explicit fan art of their favorite characters.

The referee enforced the blood rule after the player cut his forehead, stopping the match until he received treatment.