A beam or bar fixed or placed across something else:tall pillars of brick with wooden crosspieces...
I clung to a crosspiece between two beams, to catch my breath.
I cover bramble rows with a fine mesh net, placing stakes with T-shaped crosspieces every 6 feet to keep the mesh from getting entangled with the plants.
Skittles come shaped like mushrooms or as small thin posts with metal crosspieces.