This interesting item from the website: http://novusordoseclorum.com/
 
 
The UPC/EAN-13 Specification or "the common barcode" 
Each line used is either fat, medium, or skinny. Gaps appear to be likewise. If you look at the example to the left you'll see the two start code lines with a circle drawn around the bottom ends. You can also see the middle and stop scan codes with the same circles. You can see that a 0 is a medium and skinny line, a 1 is two medium lines, etc., etc.

Notice the 6 on the right side. Two skinny lines. Can you see any difference between the 6 and the start and stop scan codes? Any difference you see between them is due to the limitations of the graphics program I used to scan and enhance the images.

Why would two skinny lines represent a 6? Maybe it's because in pure computer code (binary), a 6 is represented as 0110...

There is that number 11 again. The two skinny lines even look like the number 11, or the two towers. Many elevens were woven into the events of that day, 9/11.