AKA: A9 sus4, A ninth suspended fourth, A9sus, A nine suspended, A Dominant ninth suspended 4
A ninth suspended fourth chord is the best option available on the Stradella system to play a suspended chord.
It’s very similar to a ninth eleventh chord but it does not have either the 3rd nor the 5th and the 11th is seen as a 4th.
A, D, G, B
R, 4°, m7°, 9°
A + GM
2 + 4
3 + 5