On 19 Sep 2012 at 18:54, Fred Cisin wrote:
  On Thu, 16 Dec 2010, Al Kossow wrote:
 > There was an attempt at establishing what can roughly be described
 > as an upside down Q for a slashed O. The only example I know of
 > where someone used this are in line printer listings from SDS in the
 > late 60's. I would have to do some serious digging in magazines to
 > find who was pushing this as a standard. They end up looking like
 > misformed  8's. It does terrible things to OCR. 
Well, remember the OCR-A font?  Square zero and diamond-shaped "oh"?
At some point, CDC decided that it would be great to use for office
correspondence (some manuals were even done in it).  I had a
typerwriter in my office with that font and I thought it was one of
the ugliest fonts I'd ever seen.  OCR-B was much, MUCH better.
Fortunately, CDC dropped the idea after a couple of years.
I probably still have a document somewhere with the "looped" ohs.  I
can't recall for the life of me who used the convention.
--Chuck