Just like a minor chord, the half-diminished 7th chord is constructed using a minor third interval, so the roman numeral is shown in lower case. The roman numeral for number 7 is ' vii', and is used to indicate this is the 7th chord in the scale. This subtonic 7th chords root / starting note is the 7th note (or scale degree) of the Bb major scale. The B-flat major chord vii ø 7 is the A half-dim7 chord, and contains the notes A, C, Eb, and G. This step shows the subtonic 7th chord of the B-flat major scale.
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