This utility should be removed from the MapServer codebase, as it has not worked since year 2003, it is based on the GD library which was removed from MapServer, and no packages distribute the utility.
Creates a graphic dump of a symbol file. Output is either PNG or GIF depending on what version of the GD library used. (this utility is not currently included in pre-compiled packages, due to issues mentioned in bug#506)
sym2img [symbolfile] [outfile]