In music, a whole tone scale is a scale in which each note is separated from its neighbors by the interval of a whole step. There are only two whole tone scales, each using half of the pitcheses in the chromatic scale.
Claude Debussy and other Impressionist composers made extensive use of whole tone scales; since they are symmetrical, whole tone scales don't give a strong impression of the tonic.
An die Jugend
String Quartet No. 5 (Bartók)
Violin Concerto (Berg)