Sorry to follow myself, but I thought of a better one: Kata.
The first thing that comes to mind when the word is by itself, particularly in these arts, is "form", or "shape", refering to the training drills/techniques. That is written with the following kanji: 型
Alternatively, it could mean "single", as in Katamune Dori (Single lapel capture, Takagi Yoshin Ryu etc), in which case it's this kanji: 片
Once again, it could refer to "shoulder", as in Kata Guruma (Shoulder Wheel, as found in Judo), and is this kanji: 肩
As you can see, knowing the kanji can be essential if you want to get a real translation of these names. By the way, Bruno, how many are you up to now?