org: wrap

 
 14.8.2.24 ‘:wrap’
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 The ‘:wrap’ header argument is used to mark the results of source block
 evaluation.  The header argument can be passed a string that will be
 appended to ‘#+BEGIN_’ and ‘#+END_’, which will then be used to wrap the
 results.  If not string is specified then the results will be wrapped in
 a ‘#+BEGIN/END_RESULTS’ block.