org: tangle

 
 14.8.2.7 ‘:tangle’
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 The ‘:tangle’ header argument specifies whether or not the code block
 should be included in tangled extraction of source code files.
 
    • ‘tangle’ The code block is exported to a source code file named
      after the full path (including the directory) and file name (w/o
      extension) of the Org mode file.  E.g., ‘:tangle yes’.
    • ‘no’ The default.  The code block is not exported to a source code
      file.  E.g., ‘:tangle no’.
    • other Any other string passed to the ‘:tangle’ header argument is
      interpreted as a path (directory and file name relative to the
      directory of the Org mode file) to which the block will be
      exported.  E.g., ‘:tangle path’.