A bondage hook is a blunt-headed hook used for bondage purposes.
The basic "nose hook" model has two hooks fastened on the other end of a strap, one hook for each nostril. They may be used to force a person to bend his or her head backward in a domineering context.
Another common "nose hook" model has a strap with one hook on each end. The strap goes behind the head and hooks are put in the nostrils to stretch them open sideways.
Nose hooks are commonly depicted in Japanese bondage pornography.
The "mouth hook" looks similar to a sideways spreading nose hook. It also has a strap placed behind the head and one hook on each end but it is used for spreading a person's mouth open sideways.
A "butt hook" or anal hook is approximately a half-inch thick and has a ring on the straight end for a rope attachment. The curved end is inserted into either a vagina or anus. Tail hooks that are not "Pussy Hooks" are sometimes referred to by the term "Ass Hook" or "Tail Hooks".
The "pussy hook" (also known as "pussy hanger") is a special model of tail hook. It has a sharper angle and longer shaft than a normal tail hook. It is also thicker than a normal tail hook (approximately one inch thick). Some models have a ring at the end for a rope to be attached (much like the other hooks). Anchor shaped "double pussy hooks" exist for two simultaneous users.