IEC/SC 3C - Graphical symbols for use on equipment

Standardization in the field of graphical symbols for the human interaction with equipment regarding methods and rules. Included: - Basic design rules for graphical symbols. - The design of graphical symbols for particular applications. Graphical symbols for use on equipment are primarily intended to: - identify the equipment or a part of the equipment (e.g. a control or display); - indicate a functional state (e.g. on, off, alarm); - designate connections (e.g. terminals, filling points for materials); - provide information on packaging (e.g. identification of contents, instructions for handling); - provide instruction for the operation of the equipment (e.g. limitations of use).