B68 is a designation used in various contexts, including scientific research and product identification. In the realm of astronomy, B68 refers to a specific dark nebula located in the constellation Ophiuchus. This nebula is notable for its dense clouds of gas and dust, which obscure light from stars behind it. In a different context, B68 can also refer to a model of a product, such as a type of battery or electronic device. These products are often categorized by their model numbers to help consumers identify features and specifications.