The Japanese martial art of wielding the bō is bōjutsu. The basis of bō technique is te, or hand, techniques derived from quanfa and other martial arts that reached Okinawa via trade and Chinese monks. Thrusting, swinging, and striking techniques often resemble empty-hand movements, following the philosophy that the bō is merely an "extension of one’s limbs". Consequently, bōjutsu is often incorporated into other styles of empty hand fighting, such as karate. The "bō" is also used as a spear and long sword in some of its motions, such as upward swing and slashing motion across the body as well as extensions by gripping one end and thus increasing its length as thus making it similar to a spear.