A BULLDOG clip is a clip manufactured under the BULLDOG trade mark owned by Setten IXL Limited.
The device is commonly used for temporarily binding sheets of paper together and a popular range is one which consists of a rectangular sheet of springy steel curved into a cylinder, with two flat steel strips inserted to form combined handles and jaws. The user presses the two handles together, causing the jaws to open against the force of the spring, then inserts a stack of papers and releases the handles. The spring forces the jaws together, gripping the papers firmly.
BULLDOG is a registered trademark throughout the world in relation to stationery equipment. Its registration as a trade mark in the United Kingdom dates back to 1944.