The jo was also adapted by Morihei Ueshiba, the founder of aikido,
to teach the principles of aikido. His use of the weapon is called
aikijo. Aikijo resembles jodo in that both involve
fencing with the jo, but differs in the nature and purpose of the
fencing. Jodo techniques are often faster and sharper because angular
attacks and defenses are part of its combat orientation. Aikijo
techniques are slower and softer because circular movements can blend [with]
attacks and defenses and reduce the attitude of conflict. Inserting and
entwining techniques are not found to the same extent in aikijo as they
are in jodo, nor are the numerous targets of atemi waza. Aikijo does
have jo-taking and jo-keeping
techniques, but these are aikido throws in
which the jo is incidental to the throw rather than essential to
it. Thus, while aikijo is more limited than jodo because it has fewer
targets and fewer kinds of movements, it is also much broader in that
its application does not depend on a four-foot staff but on the
fundamenatal movements of aikido.
D. Zier and T. Lang Jo - The Japanese Short Staff 1985.
Jo Tori (Jo is taken from attacker)
Jo and Taijutsu (Attacker tries to take the jo)
Jo Forms (jogi)
Just as jujutsu (grappling) became judo, and kenjutsu (sword fighting)
became kendo, jojutsu became jodo.