- Refers to the context of or associated specifically with the modern political entity of the United States of America.
- A type of stiff pasteboard that is thicker than 0.006 inches, typically consisting of good-quality chemical pulp or rag pasteboard, and varying greatly in type and stability. High quality archival cardboard is made from rag pulp and has a low acid content, used for mounting prints, drawings and watercolors. Other grades of cardboard is used for cards, signs, printed materials, and high-quality boxes. Inferior grades of cardboard, such as corrugated board, are made from coarsely ground sulfite treated wood pulp; for this board, use "corrugated board." The first carboard box was produced in England in 1817. Corrugated cardboard was patented in 1871.