Tri-Beam (Kikohou) is an energy attack used by Tien, and is one of his most powerful attacks. First, Tien puts his hands in a triangle shape, then zooms in on the opponent, then fires a triangle shaped beam of energy. It is dangerous to the user as it is powered by the users life-force. There are other variations or this attack, including Neo Tri-Beam, and Spirit Tri-Beam. In addition to being able to kill the target, the Tri-Beam can easily kill the user, as it drains their life energy. The attack has a tendency to cast the entire environment around it in a deep orange glow. Interestingly, this technique leaves a square hole in the ground, instead of a triangle. The attack formation itself places the hands in a seemingly awkward position; and it appears that later in the series, the finger tips are touching, and the thumbs are the only things that overlap. After training with Korin, Kami, and later King Kai, Tien perfects the attack as the "Neo Tri-Beam," which is essentially an "upgraded" form of the attack that allows him to control and enhance how much energy he puts behind it, inflicting even greater damage. This upgraded attack is powerful enough to hold even Semi-Perfect Cell at bay, which Android 16 could not even hurt him. The attack is extremely powerful, and despite the massive gap between Cell and Tien's powers, Cell was unable to break through the repeated blasts, though they did not inflict any real damage to him. Tien eventually collapsed from using the technique too much, but was saved from Cell by Goku.
While Cell himself has not been seen using it (although he possesses data about Tien's techniques), during the Cell Games Saga, the Cell Juniors attacked Super Saiyan 2 Gohan with it, although to no avail.