Fer-a-loup
A curved piece of metal with a loop, used as an anchor for a wolf trap. In German heraldry it was also known as a "Wolfsangel," although that name can also refer to the hook that would be attached and baited, which we would blazon a crampon.
No default posture.
No default orientation.
No default tincture.
See also: Fer a-Loup in Pictorial Dictionary of Heraldry.