Serial number
It means model year 1994.
Here what I found but the credit goes to Kobernus. I hope he doesn't mind. Many good information on his site:
http://kobernus.com/hunter260/hin/HIN.html
Here's an example for a 2003 Hunter 260, hull number HUNF0296A303
HUN – The U.S. Coast Guard assigns each boat builder a 3-letter identification code and keeps this in a Manufacturers Identification Code (MIC) Database. Information on this code can be found on the U.S. Coast Guard boating safety site:
http://www.uscgboating.org/regulations/boatbuilder_s_handbook/part_1_c.aspx
(I replaced his link, which did not work)
F0296 – The 5 digit hull serial numbers are next. This series of numbers and letters, assigned by the manufacturer, must be unique to the boat.
A – This is the month the hull was manufactured. Each of the 12 months is represented by a letter starting with A. In our example, "A" means this boat was manufactured in January. "L" would be a boat made in December.
3 – Year of certification or manufacture.
03 – Designates the model year. In this case the boat is from the Hunters 2003 model year.