A Pitot tube is a device used to measure fluid velocity in a wide range of applications, including aeronautics and fluid dynamics. A synonym for the Pitot tube is the Prandtl tube, which is a modification that allows for more accurate measurements in low-speed flows. Another synonym is the impact tube, which refers to the principle that the fluid's kinetic energy is converted into potential energy as it enters the tube. The Pitot-static tube is also a synonym, which is a type of Pitot tube that can measure both fluid velocity and static pressure. Overall, there are numerous terms used to describe variations of the Pitot tube, each designed for specific applications.