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The Web 2.0 scientific calculator using hyphen-minus sign (U+002D) on the button, but it looks a bit short when comparing to the plus sign. I suggest using U+2212 (−, %amp;minus;) instead for sidign consistency.

 

off-topic
 Feb 1, 2019
 #2
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Agreed, but does it really matter, I mean, its still working, If it bothers you that much, send a message to the admin console.

 Feb 2, 2019

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