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
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