This Kata is a weapon kata, part of Iwama Aikikai Aikido as thought by Hitohiro Saito.
Description of Yon no tachi
Video of Yon no tachi
The video is the courtesy of Sensei Miles Kessler (Hebrew biography), a proficient Vipassana instructor and a 5th Dan Aikido Aikikai teacher who volunteered his skills for this martial arts wiki.