Number sign. Pound sign. Octothorpe. A hash. Hashtag. #. What is it? What is its purpose? And most importantly: how can you use it to increase your press release’s visibility? The “hashtag” ...

In some programming languages, the number sign (#), also called the "pound sign" and "hash sign," is used as a not-equals symbol. For example, the expression if amount # 500 means "if amount not equal ...