The minor pentatonic scale we have been using so far is actually one of five possible fingerings for this scale, which cover the whole fretboard when placed together end to end. A good way to memorize these fingerings is to relate them to common chord shapes. Here again is the scale.
Notice the positions of the key notes and how they form a triangular pattern. Looking at a common E chord you can see that its key notes (root notes) form the same pattern. This pattern also occurs in the E form bar chord.
Because of the identical positions of the key notes, our pentatonic scale fingering can be called the E form of the scale.
Here is a 12 Bar Blues solo in the key of A using the E form minor pentatonic scale.