Beta Centauri is a star in the Centaurus constellation. It is also known by other names, including Hadar, Agena, and Beta Centauri A. The name Hadar originates from Arabic, meaning "ground" or "base," while Agena is derived from Latin, meaning "knee." Beta Centauri A is the brightest component of the Beta Centauri system and is often referred to as simply "Beta Centauri." Another synonym for Beta Centauri is HD 101379, which is used to identify the system in databases and scientific literature. The star is an important navigational point for southern hemisphere observers and has been used for centuries to help sailors and travelers find their way.