There are many different types of disconnect terminals that can be used for a variety of electrical applications. These include ring, brazed seam, and fork terminals as well as push-in and spring clamp terminal blocks.

A ring terminal is one of the most common wire connectors used for industrial applications. They are easy to install and provide a solid connection that will not slip or dislodge when installed correctly.
These terminals are designed to slide over a stud, and they are usually locked into place with a nut. These are ideal for bus bar studs and feed-through connectors that have multiple wires attached to them.
Fork terminals are another popular type of disconnect terminal that is useful for quick disconnection when a nut needs to be removed from a stud. They are not as strong as ring terminals but are still convenient when installing on a stud.
A crimp ferrule is a soft metal tube that is crimped onto the end of a stripped wire to protect the strands inside a terminal from fraying. Most ferrules are made of copper, and they are sized for a specific gauge of wire.
Most ferrules have a flare on one end that collects and bundles the individual strands of wire as they are inserted into the ferrule. This flare is normally covered by a conical plastic cable entry sleeve, so it is not visible when looking at the ferrule.