Kosho (The Prisoner)

Kosho is a fictional sport or martial art conceived by Patrick McGoohan for the 1967 television series The Prisoner. The exact significance of the name is not clear, though 'Kosho' (which can be translated as 'old book, rare book' '古書') is apparently a word applied to certain ancient martial arts that were practised in secret at the time when karate was forbidden.
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