Corner case is a term used in computer science and engineering to describe a set of conditions that occur rarely or infrequently, but can cause unexpected or unpredictable results. Some synonyms for this term include edge cases, boundary cases, outlier cases, exceptional cases, and fringe cases. These terms all refer to the same idea of testing the limits of a system or program by exploring scenarios that are outside the norm. It is important to account for these types of cases in testing and development to ensure that the system is robust and can handle unexpected situations. By considering edge cases, developers can avoid potential bugs and create more reliable and efficient software.