Thanks Guest,
The site you provided calls it an A4, but this doesn't make sense to me, since D is the fourth of A and this chord has no D. To me it's an A chord with an added B, which is the second note in the A scale, as suggested by Wesley, however, in order to add the B, we removed the C#, or the third of the chord, meaning it can be either major or minor. I've been calling it an A+2, but would like to be sure.