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Symbol 
Declined
Pourquoi GeoGebra, qui est un logiciel de Mathématiques, utilise comme symbole de parallélisme
et non pas
?
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ok
i ask it differently
In France, all teachers and school books * use //
Perhaps, in other countries, they use  ..?
@ Michael : In England perhaps..? or other countries..?
Edit * and students..!
The Unicode symbol is https://www.compart.com/en/...
It's up to the font designer whether it's rendered as  or //
This one exist too
https://www.compart.com/en/...
and it is referring to symbols that every teacher, every book, every student use in mathematics
Is the font designer a Mathematician..?
GeoGebra isn't a Mathematics Software Program..?
Why Mathematicians refuse use Mathematician's notations..?
And, in GeoGebra,  is "or" not "parallel" !
I can not see 1736 in FF win7
1736 is Philippine Double Punctuation
 is OR, ∥ is parallel, they are different. If you don't like how ∥ is rendered you can complain to Unicode/Apple/Google/Microsoft/your favourite font designer  there's nothing we can do about that
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