The term 'FIELD WITH CASES AND BRIEFS' can be summarized as 'LAW', which is a 3 letter word. LAW is a field of study that involves the study and practice of governing rules and regulations. It encompasses a wide range of topics, including criminal LAW, civil LAW, international LAW, and constitutional LAW. Lawyers are trained to analyze cases and briefs, which are legal documents that outline the facts of a case and the arguments for and against a particular legal position.