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A caltrop is common name given to some (unrelated) plants that have seed heads with 4 or more sharp spikes, arranged so that one of them is always pointing upwards. The seed heads are very painful to step on.
Metal devices of the same name and design can be thrown onto roads in front of cars to burst their tires.
Metal devices of the same name and design can be thrown onto roads in front of cars to burst their tires.