I grew up on a farm, so we used different terms. Here is the actual breakdown on the most universal terms I have found:
The
Shackle is the whole thing and applies to a variety of terms, including a verb (I shackled this to that) or a noun referring to any one of several means of attaching two things together via some form of
yoke or
basket and some form of retaining pin or
bolt. At it's most
base level, the
Clevis is the retaining
element, the
Basket or
Yoke is the
connector, and the
Shackle is the whole kit.
When attaching an implement to a tractor with the typical method, you slide the
yoke or
basket over the drawbar and insert a
Clevis pin which makes the whole apparatus a
shackle.
So to be plain, the
Shackle is the method, and the item pictured below (in theater) is usually called a
Shackle. Much like calling a 3/8" grade 8
bolt a "fastener." It's a
bit of a generic name. The real name for what is pictured below first is a Clevis-and-yoke
Shackle. In truth, a quicklink (threaded chain link) is a "
shackle," but not rated for rigging. In theater terms, calling the whole thing a
Clevis is less accurate since the
clevis is just the pin part.
Things get tricky when you talk about threaded versions where the
basket has either male or female threads... for instance, a
turnbuckle like the second picture has what appears to be a
Clevis Shackle on the end, but because it is a threaded fastener, they are commonly referred to as "jaws." The retaining pin is still called a
Clevis and can be either a slip-fit pin with a cotter key,
wire, or other retention device, a
bolt and
nut, or one side of the jaw may be threaded and the
clevis itself is threaded. In that order, they are usually called
Clevis Pin,
Clevis bolt, or
clevis screw.