The is one of the following nearly identical termination anchors:
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My first impression was that these were designed for members of the bigger-is-better crowd and for people who don't know how (or can't be trusted) to tie knots. Even so, users should be particularly careful to follow the rigging illustrations exactly, even when it not provided. The typical illustration, if one exists, has an Escheresque feel that makes it easy to overlook some of the subtleties required for proper use. By the way, the rigging illustrations, when they exist, do not always completely agree with each other.
These can be used to create an anchor that can be released under load, but that can be done without requiring special equipment. These might prove useful in some specialized situations (perhaps in training rigging?), but I don't see much need for these in general caving or climbing.