Pocket calculators have been an essential tool for many people, whether for work, school or personal use. There are plenty of synonyms for the term "pocket calculator," and some of them include handheld calculator, mobile calculator, portable calculator, pocket-sized calculator or even mini calculator. These devices are typically small, battery-powered calculators with a variety of mathematical functions. They are easy to carry around in a pocket or a small bag for convenience. In today's technological age, many people may simply use their smartphones as a calculator, but the traditional pocket calculator continues to serve a valuable purpose in many situations.