In addition to triads, the Roman numeral analysis system also identifies diatonic seventh chords.
Let's discover these analysis symbols of the major and harmonic minor scales.
A three step process is used.
First, write the analysis symbols for the corresponding diatonic triads.
Finally, add a slash through the circle of each half-diminished seventh chord.
Some theorist use a variation of this system.
They prefer to add an upper-case 'M' to each seventh chord which uses a major seventh.
Although we will not use their system, you should be aware of its existence.
Next, let's look at inverted seventh chords.
The previously-discussed 7 identifies a root position seventh chord.
6 and 5 identify a first inversion seventh.
4 and 3 identify a second inversion seventh.
A lone 2 identifies a third inversion seventh chord.
Let's arrange the symbols in a different way. Notice anything unusual?
The inversion numbers are in numeric order from 7 to 2.
You can use this pattern to remember the inversion numbers for seventh chords.