Wikipedia
Fetterlock
Fetterlock is a sort of shackle which is a common charge in heraldry, often displayed in a way resembling a padlock.
Edward IV used a heraldic badge consisting of a fetterlock and a falcon. This was originally the badge of the first Duke of York, Edmund Langley, who used the falcon of the Plantagenets in a golden fetterlock. This was also used by his grandson Richard of York, who displayed the fetterlock opened.
Usage examples of "fetterlock".
Seek your answers from Mistress Maedura at the Fetterlock Inn, from sunset on every day of Festival.
Comrades, mark these three mots, it is the call of the Knight of the Fetterlock.