Source : Webster's Revised Unabridged Dictionary (1913)

Cangue \Cangue\ (k[a^]ng), n. [Written also {cang}.] [F. cangue,
   fr. Pg. canga yoke.]
   A very broad and heavy wooden collar which certain offenders
   in China are compelled to wear as a punishment.

Source : WordNet®

cangue
     n : an instrument of punishment formerly used in China for petty
         criminals; consists of a heavy wooden collar enclosing
         the neck and arms