The Computer Journal 1963 6(1):49; doi:10.1093/comjnl/6.1.49
© 1963 by British Computer Society
A convention to distinguish letter O from numeral zero
H. McG. Ross
Ferranti Ltd, 21 Portland Place, London, UK
To avoid confusion when alpha-numeric data and programs are read into computers, a convention is suggested to distinguish between letter O and numeral zero.

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