[libreoffice-users] Formatting Marks?

Hi Folks,

I have taken on (maybe unwisely) the task of helping an inexperience
user to change his (rather large) manually formatted document into a
styles based one, but I have immediately discovered something I have not
seen before. I don't know the which software was used to create the
original document, but it is now in odt format.

When the formatting marks are toggled on the header and footer of the
document pages show a double-headed horizontal arrowhead which I am not
familiar with. The mark I am referring to can be seen in this capture:
http://www.mediafire.com/view/qhfa8jgev37bhk6/Marks.png/file

Would someone please advise me as to what this mark represents?

Thanks & Regards
Dave

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