Tang Lang Quan, also known as Northern Praying Mantis, is a style of Chinese martial arts.
The mantis is a long and narrow predatory insect. While heavily armoured, it is not built to withstand forces from perpendicular directions. Consequently, its fighting style involves the use of whip-like/circular motions to deflect direct attacks, which it follows up with precise attacks to the opponent's vital spots. These traits have been subsumed into the Northern Praying Mantis style, under the rubric of "removing something" (blocking to create a gap) and "adding something" (rapid attack).
One of the most distinctive features of Northern Praying Mantis is the "praying mantis hook": a hook made of one to three fingers directing force in a whip-like manner. The hook may be used to divert force (blocking), adhere to an opponent's limb, or attack critical spots (eyes or acupuncture points). These techniques are particularly useful in combination, for example using the force imparted from a block to power an attack. So if the enemy punches with the right hand, a Tang Lang Quan practitioner might hook outwards with the left hand (shifting the body to the left) and use the turning force to attack the enemy's neck with a right hook. Alternately, he/she might divert downwards with the left hook and rebound with the left wrist stump to jaw/nose/throat. The "praying mantis hook" is also part of some of the distinctive typical guarding positions of the style.