Tekki Nidan, sometimes called Naihanchi Nidan, is a string of Karate tecniques trown together into a memorable pattern known as a "kata". For many, kata are all about learning an aesthetic set of movements in order to pass an exam for a new belt level.
For us, the kata are an encyclopedia of self defence applications written in short-hand. John Burke sensei extrapolates the situations and the circumstances to make the movements relevant to the modern karate student.
Tekki Nidan, then, becomes a set of strikes to anatomically vulnerable locations, throws, locks, and restraints to be used in situations that could really occur - the hook punch, the grappler, etc rather than another martial artist's choreographed attacks.
This is a video, about an hour long, that explores the possibilities.