The term TRIG, E.G. is an abbreviation for trigonometry, which is a branch of mathematics that studies the relationships between angles and sides of triangles. Trigonometry is used to calculate distances, heights, and angles in many fields, including engineering, navigation, and astronomy. The crossword solution for the term TRIG, E.G. is MATH, which is an abbreviation for mathematics, the study of numbers, shapes, and other abstract concepts.