The term "fastball" is a commonly used colloquialism in baseball when referring to the type of pitch where the ball is thrown at high speeds. However, in the field of sports science, there are many synonyms for fastball used to describe this particular type of pitch. These synonyms include terms such as power fastball, fireball, heat, gas, and express. These terms are descriptive of the pitch's velocity and the physical exertion required to deliver it. In summary, whether it's called a fastball, power fastball, fireball, heat, gas, or express, the objective remains the same: to throw the ball as fast as possible.