AT: "mu"
A 2K16 Kub surface-to-air missile
The 2k16 Kub (or SA-6) was a type of mobile surface-to-air missile used in the mirror universe on Earth during that planet's 20th century. (ENT: "In a Mirror, Darkly")
Although not mentioned by name, the 2K16 Kub SAM (pictured, right) appeared in the opening credits, indicating the weapon was manufactured and used in that universe.