handrail(n = noun.artifact) balusters, balustrade, banister, bannister - a railing at the side of a staircase or balcony to prevent people from falling;
is a kind of barrier
is a part of balcony
has parts: baluster, rail, railing

   a rail{1} at the side of staircase or balcony to prevent people from falling; -- shaped so as to be conveniently gripped with the hand; as, please hold onto the handrail when crossing the walkway. [WordNet 1.5]

handrail, n. a narrow rail for holding as a support on stairs etc.