In music, the Arabic scale is arrived at by either:

• Raising the seventh of the Jewish scale
• Raising the seventh and third of the Phrygian mode
• Lowering the sixth and second of a major scale

Series of intervals:

H -3 H W H -3 H

H = Half step

W = Whole step

-3 = Minor third or 3 Half steps

As you can see, the Arabic scale is symmetrical.

The Arabic scale on C, C-Db-E-F-G-Ab-B: