blues scale

Short definition from Wiktionary

Noun

1. 1
   A minor hexatonic scale originating in the American musical genre blues, consisting of tonic, minor third, fourth, diminished fifth, fifth, and minor seventh, in which notes, particularly the minor third, fourth, diminished fifth, and minor seventh may be bent. It can also be called the minor blues scale when distinguishing it from its only other functional mode the major blues scale.