What does this icon in the item list mean?

I did a quick review of the documentation and couldn’t find an answer - can you tell me what the icon in the screen grab attached means? Thanks…
image.jpg

It means that the document is a duplicate of another document.

Thanks again, Greg.

Sure thing. As a FYI, the icons appear under the ‘ICONOLOGY’ section of the manual (page 131 of DTPO).