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Wasn't it basically the X11 window system logo?

It's confusingly similar (by the "average person" metric( but I don't think it's identical

The average person has absolutely never heard of X11.

The average person has absolutely no need to know what X11 is to compare the visual appearance of 2 images.

Buc-ee's has won infringement suits against far less confusing logos.

It's an X from the blackboard bold range in Unicode.