Are you also aware that a bola is the name for a weapon consisting of two weighted spheres at each end of a rope, which is used to trip up and detain an adversary by throwing it around their legs? Anyone who has read Batman comics or watched Batman: The Animated Series is well aware of this, since the Dark Knight grossly overuses the bola against his adversaries (to the point that I started getting sick of seeing him use it every time I read the books or watched the show).