Seiken (聖剣, Seiken) is a karate practitioner's straight punch, shot from waist. Punching techniques in Karate are called tsuki or zuki. Seiken is a punch with the first two knuckles.
The Seiken punch is a normal technique of all karate fighters from Baki series.
It is one of the most versatile and powerful weapons of Okinawan karate. To make a proper fist, fighter had to start by extending all four fingers and pressing them tightly together.