The stiff rod to which you are referring is a LEVER. The pivot point is the Fulcrum.
A lever. The fixed point is called the fulcrum.
One such example would be an old-fashioned weighing scales.
The wheelbarrow is a lever because it pivots about a focal point called a fulcrum, in this case located at the wheel.
A lever pivots on a fulcrum.
Lever, the fixed point is the fulcrum.
the inclined plane.
The point where a lever pivots is called a fulcrum.
A lever is a simple machine but it is made out of a stiff bar that moves freely around a fixed point.