Carbon tetrahalide is a chemical compound consisting of one carbon atom and four halogen atoms. It is a colorless liquid and is commonly used as a solvent for oils and waxes. Carbon tetrahalide is also known by other synonyms, such as tetrachloromethane, carbon tetrachloride, and carbon tet. Tetrachloromethane is a widely used synonym for carbon tetrahalide as it is a common constituent in fire extinguishers. Other synonyms include perchloromethane, which is used as a refrigerant, and carbon chloride. Carbon tetrahalide is also commonly referred to as tetra, CT, or CCI4.