Nacelle pylon
From Memory Alpha, the free Star Trek reference.
A nacelle pylon is a large support beam that connects a warp nacelle to the hull of a starship.
During the Year of Hell, USS Voyager's nacelle pylon beagn to buckle as a result of encountering a micro-meteoroid shower while operating without the use of it's navigational deflector. (VOY: "Year of Hell, Part II")
