i am currently in the middle of dealing with updating my company to ISO 13485, ISO 9001, and CE Marking for MDD. i work for a medical manufacturing company that makes measuring instruments with a device displaying function; it is not digital in nature, and therefore has no power source. recently i posted a thread pertaining to universal symbols for packaging and labeling, and was advised to check into the GUM and VIM. thank you to all of you for your help, but i have had a few more questions arise due to this newfound information:
1. i was wondering if anyone knows of a universal symbol system relating to the following terms: "calibration", "dead band", "drift", "reference standard", "working standard", etc.
2. my specific inquiry relates to displaying the exact information "+ - 3" on my packaging and IFUs. what is the universal symbol, if any, for this translation; or do i have to have the words "plus minus three" translated into the EU languages? the closest terms i have found thus far have been "span of a nominal interval" (e.g. -10V to +10V, the span is 20V), "dead band of a measuring function", "drift of a measuring system", "reference measurement standard", "working measurement standard", etc.
thanks very much, in advance, for any information on the subject, as it will be greatly appreciated.

I do not, but hopefully someone here does.

Maybe one of the following standards could help you:

IEC 60417-DB-12M Graphical symbols for use on equipment - Part 1: Overview and application (IEC 60417-1:1998).

IEC 80416-1 Basic principles for graphical symbols for use on equipment – Part 1: Creation of symbol originals

ISO 3864-1:2002 Graphical symbols – Safety colours and safety signs – Part 1: Design principles for safety signs in workplaces and public areas

ISO/IEC 80416-2 Basic principles for graphical symbols for use on equipment – Part 2: Form and use of arrows

ISO/IEC 80416-3 Basic principles for graphical symbols for use on equipment – Part 3: Guidelines for the application of graphical symbols

ISO 7000: 2004 Graphical symbols for use on equipment - Index and synopsis.

ISO 15223:2000 Medical devices - Symbols to be used with medical device labels, labelling and information to be supplied.

ISO 15223/Amd 1:2002 Medical devices - Symbols to be used with medical device labels, labelling and information to be supplied – AMENDMENT 1.

IEC TR 60878 Graphical symbols for electrical equipment in medical practice.

HTH