Roman Numeral Chord Notation

The chords of the Major and Minor scales can be indicated by roman numerals.Major chord: I, II, III, etc. Minor chord: i, ii, iii, etc. Augmented chord: I+, II+, III+, etc. Diminished chord: vi°, vii°, etc. Half-diminished chord: viiØ7, etc. Extended chords: ii7, V9, V13, etc.Altered tones or chords: #iv, ii#7 Chords of the Major Scale: Chords of the Natural minor scale: Chords of the Harmonic