A termination fitting for wire rope, most often used with 1/16" GAC, for hanging of lightweight banners and scenery.
http://www.gripple.com/us/products/catalogue/industrial/products/catenary/indoor/catenary.html
A device with similar purpose.
http://www.controlbooth.com/wiki/Verlock
http://www.gripple.com/us/products/catalogue/industrial/products/catenary/indoor/catenary.html
A device with similar purpose.
http://www.controlbooth.com/wiki/Verlock