Diamond

The Borg Queen uses a diamond-shaped ship to direct all Borg operations. This ship is contained within the Unicomplex, the Borg's base of operations. The weaponry of this ship includes both fore and aft torpedo launchers. Like the Borg cube it can travel at transwarp speeds, allowing it to outrun its enemies if needed.

One such ship was destroyed when the USS Voyager collapsed the transwarp conduit the ship was traveling in. It remains unknown if any more exist.