Term: Launch Rod (noun):
A stiff rod, whose diameter can be from 1/8" to 1" depending on the size and weight of the rocket, along which a rocket flies for the first few feet of its travel. The launch rod stabilizes the rocket's flight while it builds up air speed.
Term: Launch Lug (noun):
A tube attached to the side of the rocket to accommodate a launch rod, to stabilize the rocket while building up air speed.