A distribution node was a device on Borg vessels that controlled the distribution of data to various areas of the ship. A power distribution node controlled the distribution energy. They resembled small green pyramids.
In late 2366, an away team from the USS Enterprise-D boarded a Borg cube headed for Earth and destroyed several power distribution nodes, in an effort to bring the cube out of warp and give them a chance to use their main deflector weapon. (TNG: "The Best of Both Worlds")