On 4/27/22 10:51, Craig Ruff via cctech wrote:
> Having gone through many mathematics courses it was common to also place a 
> slash on the letter Z to distinguish it from the numeral 2. Also for persons 
> from Europe where they slashed the numeral 7 to distinguish it from a numeral 
> 1 that commonly had an initial small upward stroke at the top when hand 
> written.

Not just a small initial upward stroke on the "1", but in some European
countries (I'm thinking of Germany and the Netherlands), some make that
stroke at least half the height of the number, if not more.  I have no
idea where the long top stroke originated.


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