A martial art in which two armoured opponents fight inside a ring with long staffs while wearing visors that block their sight, relying on sound sensors in the weapon.
Anbo-jyutsu is seen in the episode The Icarus Factor. Kyle Riker, a civilian adviser to Starfleet, comes aboard the Enterprise-D to brief his estranged son William on a command he has been offered. After fifteen years of silence they can barely speak.
The two settle things in the ship's gymnasium with a match, as they did when William was a boy. Each wears padded armour and a helmet with a solid visor, and carries a staff with a proximity detector at one end.
William realises during the bout that his father is using an illegal move, and has always done so, because it was the only way he could go on beating him after the age of twelve. The admission finally lets them talk.