The Ibanez "U-Bar" is a tremolo bar first released for the Ibanez K7 guitar. This guitar was the signature model for James "Munky" Shaffer, and Brian "Head" Welch of the Nu-Metal band Korn. This guitar featured a Lo-Pro Edge 7 tremolo that utilized two tremolo arm holders, one on each side of the tremolo.
It was meant to allow the player to "palm" the tremolo for "whammy effects" without having to use a normal tremolo arm... all the while being able to palm mute as well. It is still offered for the APEX100 signature guitar to this day.