I'm confused between 2 XOR gate symbols, they have a minor difference but I'd still like to know if they truly are identical.

One looks like - this

The other, like this

Notice, how for one of them the input lines are connected all the way and for the other, it's not. Are they both identical, as I suspect or is there something I'm not aware about?

  • $\begingroup$ I cannot see your images. $\endgroup$ Jul 2, 2019 at 13:52
  • $\begingroup$ @YuvalFilmus Really? They should work fine, might be an issue on your side. $\endgroup$
    – Chase
    Jul 2, 2019 at 14:05
  • $\begingroup$ They work for me. $\endgroup$ Jul 2, 2019 at 16:17

2 Answers 2


There is a standard for this, ANSI/IEEE Std 91a-1991. The second version is what that standard gives for the "distinctive shape symbol" (5.1-11). So if you want to know what one is "correct", it's arguably that.

ANSI/IEE Std 91a-1991 EOR symbol

The other version is not the standard, but it's extremely common and everyone knows what you mean by it. But it's not distinct.


This is akin to asking if $B$ and $\mathcal{B}$ are really the same letter and, if not, which is correct. It makes no difference.


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