What is 304?

The number 304 can refer to several different things depending on the context. Here are a few possibilities:

1. Number: 304 is an integer that comes after 303 and before 305. In mathematics, it has some interesting properties. For instance, it is an even number and can be factored into prime numbers as (2^3 \times 19).

2. Year: The year 304 AD (Anno Domini) was a leap year starting on Wednesday of the Julian calendar. It was a time during the Roman Empire, and notable events from this period often relate to conflicts and changes within the empire.

3. HTTP Status Code: In web development, 304 is an HTTP status code that stands for "Not Modified." This is used to indicate to a client that the content has not been modified since the last request, allowing the client to use a cached version of the content instead of downloading it again.

4. Area Code: In the United States, 304 is the area code for the entire state of West Virginia. It was one of the original area codes established in 1947. Due to increased demand, an overlay area code, 681, was added in 2009.

5. Stainless Steel: 304 is one of the most common grades of stainless steel, widely used in a variety of applications due to its corrosion resistance and ease of fabrication. It contains 18-20% chromium and 8-10.5% nickel, and it’s often referred to as "18-8" stainless steel.

If you have a specific context in mind, feel free to provide it for more detailed information.