Misuse of martial arts words, terms, titles

Another area if martial arts terms being mistakenly use are listed here.

Bo staff (Bo and staff mean almost the same thing. The word Bo or Staff is all that is needed)

Katana sword (Katana means sword, so Katana or sword is ok, but both together is incorrect)

Sensei XYZ (The correct way to use the title Sensei is to place it after the name, example: XYZ Sensei. The same holds true of any title. Example XYZ Shihan, instead of Shihan XYZ)

Proper pluralization of commonly used martial arts terms

Every day I see many good martial artists misuse martial arts terms. This is usually not their fault since no one has taught them the correct way to use the terms. A good example is the practice of saying, Senseis, to indicate more than one Sensei. This is incorrect. The word Sensei can be used as it is to indicate one or more people. It does not need to have an "s" added to it to indicate more than one Sensei. The same holds true of many other martial arts terms. Here are a few examples of words that need no "s" to become plural.

Sensei, Katana, Bo, Sai, Shihan, Kata, .....

There are many more,but I think you get the idea.

Best of Luck!