H.S. Course is an acronym for High School Course, which refers to the courses offered in high school. TRIG is a 4 letter abbreviation for Trigonometry, a branch of mathematics that studies triangles and their properties. ENG is a 3 letter abbreviation for English, a language course that focuses on reading, writing, and speaking. CHEM is a 4 letter abbreviation for Chemistry, a science course that studies the composition, structure, and properties of matter. SCI is a 3 letter abbreviation for Science, a course that covers topics such as biology, physics, and chemistry. ECON is a 4 letter abbreviation for Economics, a social science course that studies the production, distribution, and consumption of goods and services. SUBJ is a 4 letter abbreviation for Subject, which can refer to any course offered in high school.