Pictish symbols

Class I and II stones contain symbols from a recognisable set of standard ideograms, many unique to Pictish art, which are known as the Pictish symbols. The exact number of distinct Pictish symbols is uncertain as there is some debate as to what constitutes a Pictish symbol, and whether some varied forms should be counted together or separately. The more inclusive estimates are in excess of sixty different symbols, but a more typical estimate is “around thirty”,[4] or “around forty” according to Historic Scotland.[1]

Source: Pictish stone – Wikipedia