Centaurus is a Southern Hemisphere constellation otherwise known as the Centaur. It is one of the 48 Greek constellations originally described by the 2nd century astronomer Claudius Ptolemy (Wikipedia). Centaurus remains one of the 88 modern constellations defined by the International Astronomical Union (Wikipedia).
Centaurus (abbrev. = Cen; genitive = Centauri) covers 1060 square degrees or 2.57% of the celestial sphere making it the 9th largest constellation. It contains 281 stars brighter than apparent magnitude 6.5, the brightest star being Rigel Kentaurus.