What is the requirement that at least four justices must approve a decision for a writ of certiorari called?

The requirement that at least four justices must approve a decision for a writ of certiorari is known as the Rule of Four. This principle ensures that a significant minority of the Supreme Court agrees that a case raises an important legal issue worthy of its review. The Rule of Four is significant as it protects the rights of parties seeking Supreme Court review from being denied simply because a smaller majority of justices may not find merit in the case. This rule effectively encourages the Court to take on cases that have broader implications for the law or address conflicts in lower court rulings, thereby fulfilling its role in maintaining uniformity in legal interpretation across the United States. Other concepts, like the Rule Against Perpetuities, Rulemaking, and Judicial Review, pertain to different aspects of law and do not relate to the process of the Supreme Court deciding which cases to hear.