Fetterlock
From Infogalactic: the planetary knowledge core
File:Complete Guide to Heraldry Fig534.png
A generic fetterlock from A.C. Fox-Davies's Complete Guide to Heraldry

Falcon and Fetterlock Badge of Edward IV
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.[1]
References
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