The term 'Introduction to Calculus' refers to a course of study that provides an introduction to the fundamental concepts of calculus. It covers topics such as limits, derivatives, integrals, and applications of calculus. The course is typically taken by students who are interested in pursuing higher-level mathematics or science courses. The term PRE, which is a three letter acronym, stands for Precalculus, which is a prerequisite course for Introduction to Calculus.