International Standards for graphical symbols are covered by Technical Committee 145 (TC 145) of the International Organization for Standardisation (ISO). TC 145’s Subcommittee 1 (SC 1) is responsible for ISO 7001:2007 ‘Public information symbols’. Nothing to see here but an ISO standards index of the most thoroughly tested symbols and procedures for testing them. They are good. They gave us A4. (http://www.designwritings.com/tag/pictogram/#.WJsF6BDOhpY)

http://www.iso.org/iso/iso_technical_committee?commid=52662