9F

9F is a designation used in several unrelated domains, rather than a single topic. Depending on the context, it can refer to a class of locomotive, a hexadecimal value, or a generic model label in various product lines.

In British railways, the BR Class 9F denotes a class of heavy freight steam locomotives with a 2-10-0 wheel arrangement. Designed for power and traction, the 9F locomotives were built by British Railways between 1954 and 1960, with a total of 251 produced. They were among the most powerful steam locomotives completed for Britain and were deployed on freight duties across the network until the late 1960s, when dieselisation reduced the role of steam traction. A small number have been preserved, reflecting the class’s significance to British railway history.

In computing and data encoding, 9F commonly refers to the hexadecimal value 0x9F, which equals 159 in decimal. The exact meaning of 0x9F depends on the protocol, encoding, or device in use. For example, in UTF-8, a byte valued at 0x9F can be a continuation byte within a multi-byte sequence and does not, by itself, represent a complete character.

Beyond locomotives and hex notation, 9F is used as a generic model or revision label in various industries. Without a specific domain, the term does not have a standardized meaning and must be interpreted from the surrounding context.