The beg.gif (108 bytes), int.gif (91 bytes) and exp.gif (72 bytes)are US trail marking symbols to indicate the degree of difficulty. because trail layout, terrain, weather, etc. varies between different ski areas, the symbols used are relative to that mountain only. A novice beg.gif (108 bytes) trail at one mountain may be an intermediate int.gif (91 bytes) trail at another. If in doubt, ask!