Crux is a Southern Hemisphere constellation otherwise known as the Southern Cross. It was introduced around 1612 by Petrus Plancius (Wikipedia). Crux remains one of the 88 modern constellations defined by the International Astronomical Union (Wikipedia).
Crux (abbrev. = Cru; genitive = Crucis) covers 68 square degrees or 0.17% of the celestial sphere making it the 88th largest constellation. It contains 49 stars brighter than apparent magnitude 6.5, the brightest star being Acrux.