What does C mean on a product?

Could you elaborate on the context in which the letter "C" appears on a product? Is it a symbol, an abbreviation, or part of a larger marking? Is this product related to technology, consumer goods, or some other industry? Understanding the specific context will help me provide a more accurate description of what the "C" might signify. Is it perhaps indicating compliance with a certain standard or regulation, a country of origin, or something else entirely?