Pas de quatre. French term usually referring to a dance in ballet among four people, literally translating as "step for four". It is generally seen as a ballet with no plot, performed for the sake of the art itself.
Pas de quatres appear in many ballets, between different combinations of female and male dancers. The most famous was the first ballet choreographed by Jules Perrot, titled Pas de Quatre, to music by Cesare Pugni. It was performed by Lucile Grahn, Carlotta Grisi, Fanny Cerrito, and Marie Taglioni, to which only four shows were made by the group due to difficulties of ego-clashes between the 4 superstar ballerinas of the time. During the third show at Her Majesty's Theatre in London Queen Victoria and Prince Albert were present, from the first to last shows the audiences and critics were left speechless.
Another Pas de quatre is done in Swan Lake, among four swans. The swans are normally demi-soloists from the corps or actual soloists.