What is fh 18?

There is not much information available about FH 18 as it is a vague and generic term. It could refer to a variety of things such as a model of a vehicle, a type of equipment, a software program, or something else entirely. Without more context, it is difficult to provide specific information about FH 18. If you have more details or context about what FH 18 refers to, please provide that information so that a more accurate answer can be given.