The term 'ACT UNIT' can be broken down into two parts. The first part, 'ACT, ' is an acronym for the American College Testing program, which is a standardized test used by many colleges and universities in the United States to assess a student's academic readiness for college-level work. The second part, 'UNIT, ' refers to a UNIT of measurement, such as a foot or a meter. Together, the two terms refer to a UNIT of measurement used to measure a student's performance on the ACT. This UNIT of measurement is typically expressed as a score out of 36, with higher scores indicating better performance.