On 28 Feb 2003 at 8:54, Paul Franklin Stregevsky wrote:

> I'm working on a technical manual whose procedures were originally written
> by a bright engineer. Yet in his drafts, he consisently writes, "Turn the
> power switch on (O), using the letter instead of the digit.

See ISO/IEC/JTC1 Graphical Symbols for Office Equipment:

http://eetd.lbl.gov/Controls/overview/symbols1.pdf

Rob Studdert
HURSTVILLE AUSTRALIA
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