The term 'GONE UNUSED' can be solved by the three-letter acronym SAT, which stands for Scholastic Aptitude Test. The SAT is a standardized test used by colleges and universities in the United States to assess the academic readiness of applicants. The SAT has been around since 1926 and is still widely used today. However, due to the COVID-19 pandemic, many colleges and universities have gone unused this year, meaning that the SAT has not been required for admission.