Bessel refers to the mathematician and astronomer Friedrich Bessel, known for his work in the field of astronomy and for developing the concept of Bessel functions. These functions are important in solving problems in physics and engineering, particularly in wave and heat equations. Bessel's contributions also include precise measurements of stellar parallax, which helped determine the distances to stars. His work laid the foundation for modern astrometry and significantly advanced our understanding of the universe. Today, Bessel functions are widely used in various scientific disciplines, including signal processing and quantum mechanics.