How many different shamus are there?

The term "shamus" typically refers to a private detective or investigator, often used in American slang. There isn't a specific number of different shamus, as the term can apply broadly to various private detectives, each with their own specialties and methods. Additionally, in popular culture, different fictional characters might be referred to as shamus, further expanding the concept. Ultimately, the variety of shamus encompasses both real-life detectives and fictional representations.