The A flat suspended second chord is a 3-note chord consisting of the notes Ab, Bb and Eb.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Absus2.
Chords that are a superset of Absus2. The chords include more notes but always Ab, Bb and Eb.
Chords that are a subset of Absus2. These contain less notes but all of them are included in Absus2.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Absus2 chord. Feel free to save or share the image as needed.