U-shaped fitting with a pin running through it. Clevis.

Merriam-Webster Online Dictionary
shackle (noun)
something (as a manacle or fetter) that confines the legs or arms
something that checks or prevents free action as if by fetters - usually used in plural
a usually U-shaped fastening device secured by a bolt or pin through holes in the end of the two arms
a length of cable or anchor chain of usually 15 fathoms
shackle (verb)
transitive verb
a) to bind with - shackles fetter
b) to make fast with or as if with a shackle
to deprive of freedom especially of action by means of restrictions or handicaps - impede hamper
shackle (Wikipedia)
Different types of shackles. The yellow cable ties indicate the date of the last tool inspection.
A well used shackle.

A shackle, also known as a gyve, is a U-shaped piece of metal secured with a clevis pin or bolt across the opening, or a hinged metal loop secured with a quick-release locking pin mechanism. The term also applies to handcuffs and other similarly conceived restraint devices that function in a similar manner. Shackles are the primary connecting link in all manner of rigging systems, from boats and ships to industrial crane rigging, as they allow different rigging subsets to be connected or disconnected quickly. A shackle is also the similarly shaped piece of metal used with a locking mechanism in padlocks.

A carabiner is a type of shackle used in mountaineering.

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