Copper (Cu) is a metallic chemical element with atomic number 29. It has a characteristic red-orange color. There are two stable copper isotopes, ⁶³Cu and ⁶⁵Cu. The most abundant is ⁶³Cu.

Copper can be found in pure form in nature, and it has been used in human civilizations for thousands of years. The name copper (cuprum in Latin) is derived from Cyprus where most copper was mined in the Roman era.

Copper is part of many well known alloys such as bronze, which is made up of copper and tin, and brass which is made of copper and zinc. The largest industrial use case of copper is electrical wiring.

Copper can be spelled using chemical element symbols: Co - P - P - Er.