Further to the interpretation of the "O" and "|" symbols:
http://ask.metafilter.com/28272/the-circle-line Be sure to explore the links in the page. Note that most people have no idea what the "O" and "|" symbols mean or even that the symbols are from standards. Other related articles: http://www.eepn.com/Locator/Products/Index.cfm?Ad=1&ArticleID=31710 http://www.energy.ca.gov/reports/2003-10-31_500-03-012F_APP.PDF In this last reference, IEC symbols are given, but the applications (uses) are not those given by the IEC. Such published divergences create confusion as to the use and intent of the symbols as demonstrated in the first URL. Standards committees spend hours debating symbols and fine-tuning their definitions. Then, designers use their own interpretations. Users have difficulty interpreting the symbols, but quickly learn through use of the equipment. Consider these power state modes: On Off Standby Hibernate Sleep "On" and "off" are reasonably clear. How are the other modes differentiated? Who (user) cares? Why do we need any differentiation (from a functional point of view)? Enjoy! Rich - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________