Crux, Latin for Cross, is the smallest of the 88 modern constellations, but is one of the most distinctive. It is dominated by a cross-shaped asterism that is commonly known as the Southern Cross because it is easily visible from the southern hemisphere, at practically any time of year.

A tradition that is widespread in Australia is that of the "Emu in the Sky", a constellation that is defined opaque clouds of dust and gas that are visible against the milky way background. The Emu's head is next to the Southern Cross.