AKA: D9 sus4, D ninth suspended fourth, D9sus, D nine suspended, D 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.
D, G, C, E
R, 4°, m7°, 9°
D + CM
2 + 4
3 + 5