The term "upper level" can have different meanings depending on the context in which it is used. Generally, however, when referring to education or a specific subject matter, "upper level" typically refers to more advanced courses or concepts that build upon previous knowledge and require a deeper understanding of the subject matter. In this sense, upper-level courses are usually taken by students who have already completed introductory or intermediate classes in the same field, and they often involve critical thinking, analysis, problem solving, and research skills.