Also known as: 木剣, ぼっけん, 木刀, ぼくとう
A lethal Kendo practice Sword made of solid, heavy wood. It's shaped and balanced like a Katana.
Bokken are normally used for solo training, not for sparring. For that, the Shinai is used, as sparring with a bokken will usually lead to broken bones... or worse.
Legendary Samurai swordmaster Miyamoto Musashi (Real Life) is said to have fought (and killed!) Katana-wielding rival samurai by using just a bokken against them.
Bokken are also stereotypically associated with Delinquent youths.