On 2010 Dec 13, at 2:27 PM, Fred Cisin wrote:
  On Mon, 13 Dec 2010, Chuck Guzis wrote:
  Another skill to be learned was the ability to
block-print neatly and
 legibly, differentiating "1" from "I", "0" from
"O", etc.  It was all
 uppercase, so that simplified things somewhat.  To this day, I still
 put a line through my "7", although I've dropped the stroke through
 my zero as most people find it to be confusing. 
 A long time ago, there used to be some people who put slashes through
 the
 letter 'o', to differentiate it from the numeral '0'.  Are they ALL
 dead
 now?
 One of MICROS~1's early attempts at OCR on their order forms gave
 examples
 of how they wanted the letters formed, and included slashing the letter
 'o'! 
Years ago as an undergrad, as I was slashing my zeros and sevens (as I
still do), a grad student tried to lecture me "decorate the alphabet,
not the numeral system". Which may be a nice idea in principal, but it
run counters to better-established conventions.