Hi George:
The dc polarity symbol is specified in:
Symbol 01060 (taken from JEIDA 11)
EIAJ CP-1104 (1998)
"Terms and Grpahical Symbols for Audio and Audio-Visual Equipment"
Technical Standardization Committee on Audio-Visual Equipment and Systems
Electronic Industries Association of Japan
This standard now specifies the mark using
diamonds rather than circles to enclose the
+ and - signs.
I'll send you a copy of the page in a separate
message (because my UNIX mail system can't send
attachments). If anyone else wants a copy,
please send private mail to me at:
ri...@sdd.hp.com
Best regards,
Rich
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