I've updated https://github.com/jloughry/Unicode with more information, the beginnings of a project plan, and some research. I think I can get all the needed IEC, IEEE, and ISO standards through my school. The next quarterly meeting is at the end of January, so I have a few weeks to get the proposal written.
Do you know how to make a TrueType or PostScript font? We need a small one that contains only the new symbols.
http://www.unicode.org/pending/proposals.html
I would be willing help work on this. We could keep the proposal documents on GitHub as a starting point for others who might need it in future.
If we are going to do this, let's include all the IEC power symbols and keep them together in a group:
IEC 5007, power on (line) symbol
IEC 5008, power off (circle) symbol
IEC 5009, standby (line through a broken circle) symbol
IEC 5010, power on/off (line inside a circle)
None of these currently in the Unicode pipeline http://www.unicode.org/alloc/Pipeline.html of symbols already proposed.