Sus4 chord - think of the guitar riff in the intro to "Crazy little thing called love". That's going D, Dsus4, D.

One interesting thing you can do with sus2 and sus4 chords is make it unclear whether you're playing major or minor - this applies particularly to sus2 chords. Leave your finger off the top E string in a D or Dm chord, or your finger off the B string in an A or Am chord, and you get that interesting mellow sound.

Grab.