The Ab/C chord is an Ab Major chord, with the C (the 3rd) as the bass note.
The chord is also referred to as Ab over C, or Ab ‘slash’ C, or simply, A flat with a C in the bass.
Technically, the Ab Major chord with the C in the bass is a first inversion A flat Major chord.
Some Ab/C Chord Theory and Info
- The Ab/C chord contains the notes C, Ab and Eb.
- It is a A flat Major chord with a C in the bass.
- The root note of Ab/C is Ab, the bass note is C.