It's a suspension chord: either Esus4/B, B7sus4, or Asus2/B. Asus2/B is the least common, the other two are common. A name given to a suspension chord relies solely on where you go next. Try going to a E minor or major chord, B7 chord, or an A major or minor chord next. Then you'll know. If it sounds good going to A minor next, it's an Asus2/B chord. This chord could go to any of the chords listed above, but you may need to find different ways of playing the following chords to have some sound good. Voicing is very important when using suspensions.

[Edited by noticingthemistake on 01-21-2004 at 04:07 PM]