Matched items are two or more items that have similar characteristics. They can be compared and contrasted to each other in order to identify similarities and differences. The term 'matched items' is often used in the context of research studies, where researchers compare different groups of people or objects to determine the effects of a particular variable. The crossword solution for the term 'matched items' is SET, which is an acronym for 'Similarity, Equality, and Tolerance'. This acronym emphasizes the importance of recognizing similarities between items, as well as respecting their differences.