The term "seventeen-year locust" is often used to refer to a group of periodical cicadas that emerge from the ground after spending seventeen years underground. However, there are several other synonyms for this fascinating insect. They are sometimes called "seventeen-year cicadas," "periodical cicadas," or "Brood X." They are also commonly referred to as "jarflies" due to the loud buzzing sound they make. These insects are known for their synchronized emergence, where millions of them will emerge from the ground at once, filling the air with their distinctive buzzing songs. The next major emergence of these fascinating insects is expected in 2021.