What is another word for caltrop?
Pronunciation: [kˈaltɹɒp] (IPA) 
A caltrop is a small, four-pointed device that is designed to impede movement, puncture tires, and injure people. Synonyms for this troublesome object include "crow's foot," "puncture vine," "jacks," and "stop spikes." These terms all refer to objects that can cause damage in a similar way to a caltrop. Other synonyms include "tack," "nail board," and "stinger," each of which describes a different object that can cause puncture wounds or prevent movement. Despite their negative connotations, caltrops and their synonyms have been used throughout history in warfare and defense, as well as by law enforcement to prevent high-speed chases.
