This international Standard specifies graphical symbols for operator controls, gauges, tell-tales, indicators, instructions and warning against risks in small craft and for engines and other equipment intended to be used for small craft of up to 24 m length of hull.
DIN EN ISO 11192:2006 Referenced Document
IEC 80416-1:2001 Basic principles for graphical symbols for use on equipment - Part 1: Creation of symbol originals