What is the meaning of Koukku?

hook (rod bent into a curved shape; used for hoisting, towing, storing items, etc.)

hook, fishhook (barbed metal hook used for fishing)

hook (tactical manoeuvre)

hook (boxing punch)

hook (catchy musical phrase)

cedilla, hook (loop shaped like a hook under certain written letters)

a medieval unit of taxation originally corresponding to one farm or homestead

catch, trick (concealed scheme or difficulty)

addiction

police, police officer

poker (tool used to handle coal in an oven)

poker (metal rod for poking)

Source: wiktionary.org