The harmonic minor scale is a seven note scale and is the same as the natural minor but with a chromatically raised seventh degree..
Major Degrees: 1-2-b3-4-5-b6-7 or I-II-bIII-IV-V-#V-VII
Stepping: whole - half - whole - whole - half - whole - half or W-H-W-W-H-W-H
Tonal: tone - semi+tone - tone - tone - semi+tone - tone - semi+tone or 2-1-2-2-1-2-1
Commonly used in: neoclassical shredding, metal,...