顶棒

bucking bar (metal bar fixing the tail of a rivet as it is driven)

stick / club / cudgel / smart / capable / strong / wonderful / classifier for legs of a relay race

apex / crown of the head / top / roof / most / to carry on the head / to push to the top / to go against / to replace / to substitute / to be subjected to (an aerial bombing, hailstorm etc) / (slang) to "bump" a forum thread to raise its profile / classifier for headwear, hats, veils etc