I need this icon to design something (in typography).

Now, I just noticed it today... at some places this icon has +45 angle of the diameter and at some places it has -45, as show in the image:

enter image description here

Is only one of them is correct?

OR there is a specific rule like: To represent something is banned or not allowed, you can use a circle and a tilted line on it, irrespective of the angle?

Also, can we alter the width of the tilted diameter line? Or it should be same as the width of circle?

1 Answer 1


I do not believe there is a "correct" angle for the divider.

However most, if not all, governmental or "official" agencies will use the -45° angle on signage.

  • My mistake. I didn't wait before I could find an existing answer on other platforms. You may want to see this thread. They also mentioned same government thing. github.com/FortAwesome/Font-Awesome/issues/1721
    – Vikas
    May 30, 2019 at 18:16
  • Would you please share your views about the edit I just did?
    – Vikas
    May 30, 2019 at 18:19
  • 1
    In fact there are not only ISO standards around the use of the interdictory circle, there are UK and US highway signage standards and a host of others... herein I link (intentionally) a Wikipedia article on this topic as it has a wealth of good solid data there as well as more referential links for further perusal: [en.wikipedia.org/wiki/No_symbol] May 30, 2019 at 18:34
  • 1
    Well, a government, just like a corporation, will have "standards and practices" which designs must adhere to. If you are working for such an agency, you should be able to find such documentation as it relates to your work. If you aren't working for a company/government with standards, you can really make up your own if alterations fit your work in a more aesthetically pleasing manner. Knowing standards set by common agencies is always helpful, if for no other reason, to be aware of what viewers commonly associate with the symbol.
    – Scott
    May 30, 2019 at 19:17
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    My point being... -45° and Pantone 187 may be a government standard. However, if -55° and Pantone 204 fits your work better, there is nothing preventing you from making that alteration in general.
    – Scott
    May 30, 2019 at 19:18

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