The Yojimbo reference article from the English Wikipedia on 24-Apr-2004
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Yojimbo

Yojimbo (用心棒; Yōjinbō) is a bodyguard, security person or sometimes assassin. Ronin and samurai with low salary are usually hired as yojimbo.

Yojimbo is also a 1961 film by Akira Kurosawa.

There is also Usagi Yojimbo (Rabbit Bodyguard), a comic book character created by Stan Sakai.