A shackle: a gyve: a shack-bolt. " 'What device does he bear on his shield?' asked Ivanhoe.
Something resembling a bar of iron, and a padlock painted blue on the black shield.'-'A fetterlock and shacklebolt azure,' said Ivanhoe; I know not who may bear the device, but well I ween it might now be mine own.' "-Sir. W. Scott.