A Tank Arrow is a powerful burst of energy fired from a Light Tank, and used to destroy enemy programs. The color of the arrow depends on the circuitry of the controlling program: Hackers are yellow and patrol tanks are red.
A tank arrow is powerful enough to destroy a Light Cycle and even a Recognizer in one carefully aimed shot. Good examples of this are when a tank arrow destroys both Ram and Flynn's Light Cyles and even Flynn's hijacked Recognizer.
Tank Arrows are featured in the TRON arcade game in which a player must destroy the enemy tanks while also dodging their blasts. Deresolution of all enemy tanks results in the player's success, while one hit from an enemy tank results in defeat.