The Craw Stane, a 'Class I Pictish Symbol Stone', located to the south of the village of Rhynie in Aberdeenshire. This stone has a salmon and Kelpie (water elephant/Pictish beast) carved on it, however these are difficult to make out in this photo due to lichen growth.
Pictish stone with engraved symbols - According to recent discoveries, these pictures and symbols may actually be a written language: http://news.discovery.com/history/ancient-scotland-written-language.htm
A Chinese scholar and government official named Wang Yirong is credited with realizing that some of these bones were inscribed with ancient writing and thus had historical significance. Today, they are called “oracle bones” and they constitute the best window available into the history, language and culture of ancient China. Because they involve specific dates, they are also an indispensible means of exploring the ancient Chinese calendar and its astronomical underpinnings