The Sune (insert pronunciation) is a well-known algorithm that affects the last layer of a Rubik's Cube, and can be applied to other puzzles. The term "Sune" was coined by Lars Petrus for his method, and is the most widely recognized name for the sequence of moves.
The Sune is most canonically written as RUR'URU2R'.
There are many algs related to and/or derived from the Sune, such as its inverse, the Anti-Sune.
The Sune can be written as a pure commutator, but is most commonly recognized as a conjugated commutator or a sequence of two commutators.