The term 'Mark of Distinction' can be summarized by two crossword solutions: CACHET (6 letters) and APLUS (5 letters). CACHET is a French word meaning a seal or stamp, often used to indicate quality or prestige. It is also used to refer to a special mark of approval or recognition. APLUS is an acronym for 'Academic Performance and Leadership in the United States, ' which is an organization that recognizes high-achieving students. Both CACHET and APLUS are marks of distinction that signify excellence and achievement.