The term 'Sly Laugh' can be represented by two crossword solutions, HEH (3 letters) and SNICKER (7 letters). HEH is a sound made to express amusement or laughter, usually in a low-key manner. SNICKER is a slightly louder and longer laugh, often used to express a sly or mischievous sense of humor. Both terms are used to describe a type of laughter that is not overly loud or boisterous, but still conveys a sense of amusement.