i have always called it /heard it called a 'brace'--

which whether i am right or wrong, brace is an interesting word..

it could be a tool (similar to a drill) or a piece of wood used to secure a right angle, or something to re-enforce or support a limb, or something (in pairs!) that hold up your pants, or in diminutive, decorative jewelry...or a pair of game birds, or....