See http://www.word.mvps.org/FAQs/Formatting/NonPrintChars.htm.
The black square indicates that the paragraph is formatted with the
Keep with next, Keep lines together, Page break before, or
Suppress line numbers property.
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Regards,
Jay Freedman
Microsoft Word MVP FAQ: http://word.mvps.org
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>Where can I find information on what a particular formatting mark means? If
>you only have the symbol, it is hard to know where to look. My immediate
>question is a black square that appears at the beginning of several lines in
>a bulleted list. However, it would be helpful to find a table that defines
>all the symbols. Thanks.