The number sign (#) is a typographical symbol that represents the word “number” in American English and in Canada. Generally placed immediately before a number or series of digits (with no spaces), it also is known by many other names and offers various other uses., In computer code, the # symbol means that everything that follows is only comment, not instruction., What is a pound symbol? The pound symbol (#), also known by many other names that include pound sign, number sign, hash mark, and hashtag, is a typographical symbol that is rarely used in formal writing. However, this symbol is used often in informal writing, specifically on social media., The "#" symbol has many names: number sign, hash sign, pound sign, octothorpe. But when should you use it in your writing? Check out our blog to find out., Meaning of the Number Sign The number sign (#), also called the pound sign represents the word number in a list or a sentence. For example, Question # 2 is pronounced as Question number 2. Since 2007, this sign is used widely in metadata tags on social media platforms, such as Twitter and Instagram., .