staple

Staple is a metal fastener used to bind materials together. It is typically U-shaped with a crown and two legs that are driven into the material by a stapler or staple gun, causing the legs to bend inward and secure the item. Staples are usually made from steel, but stainless steel or galvanized finishes are also used for corrosion resistance. Some specialized staples are plastic-coated or made from other materials.

Common applications include binding sheets of paper in offices and schools, attaching insulation or wiring, and upholstery or carpentry tasks. In document binding, the stapler drives the staple through the sheets and the legs bend to clinch the material, securing the stack.

Sizes vary by crown width and leg length. Office staples are designed for light-duty binding of documents, while heavy-duty staples are used for upholstery or construction. Staples also come in different crown widths and leg lengths to suit the material and the applicator.

As a term in nutrition, staple refers to a basic food that is regularly consumed by a population and forms a large share of its diet. Staple foods vary by region and culture, and include rice, wheat, maize (corn), potatoes, and other crops. The term highlights the economic and cultural importance of certain foods in a community's diet.

Verbs: to staple means to fasten with staples or to attach something by stapling. A document or set of papers is commonly stapled, as is upholstery or packaging when using staples.