1) Area denial weapon 
The term makibishi (撒き菱 or 撒菱) refers to the Japanese version of the caltrop. Makibishi (igadama), sharp spiked objects that were used in feudal Japan to slow down pursuers and also were used in the defense of samurai fortifications.Makibishi were one of the items supposedly used by ninja. Iron makibishi were called tetsubishi while the ...