keiretsu

bastinado (or bastinade), bat, baton, billy, billy club, bludgeon, club, cudgel, nightstick, rod, rung [Scottish], sap, shillelagh (also shillalah), staff, truncheon, waddy [Australian]

blackjack, knobkerrie, mace

birch, crabstick, hickory, rattan, stave, aster's educational tools