Kabura-ya (Japanese signal arrow) is a type of arrow used by the samurai class of feudal Japan. Kabura-ya were arrows which whistled when fired and were used in ritual archery exchanges prior to formal medieval battles. The sound was created by a specially carved or perforated bulb of deer horn or wood attached to the tip. In English, these are often called "whistling-bulb arrows", "messenger arrows", or "signal arrows." Kabura literally translates to "turnip", and thus the Japanese term technically means "turnip-shaped arrows."