Root on A string
x-11-12-11-12-x
A♭m7♭5 is the A♭ half-diminished chord. Its notes are A♭, C♭, E♭♭ and G♭. It is the same chord as G♯m7♭5. Also written ø7. Often the ii chord in a minor ii–V–i progression.
x-11-12-11-12-x
Numbers show frets from the low E string to the high e string; x means don't play that string.
A♭m7♭5 is the viiø7 chord in A major. That makes it a natural fit in songs written in those keys.
Every A♭, C♭, E♭♭ and G♭ on the first 12 frets. The filled dots are the root, A♭. Build your own shape from any nearby group.
Other A♭ chords
Other half-diminished chords