Specific header arguments - The Org Manual

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14.8.2 Specific header arguments

Header arguments consist of an initial colon followed by the name of the argument in lowercase letters. The following header arguments are defined:

var: Pass arguments to code blocks
results: Specify the type of results and how they will be collected and handled
file: Specify a path for file output
file-desc: Specify a description for file results
dir: Specify the default (possibly remote) directory for code block execution
exports: Export code and/or results
tangle: Toggle tangling and specify file name
mkdirp: Toggle creation of parent directories of target files during tangling
comments: Toggle insertion of comments in tangled code files
padline: Control insertion of padding lines in tangled code files
no-expand: Turn off variable assignment and noweb expansion during tangling
session: Preserve the state of code evaluation
noweb: Toggle expansion of noweb references
noweb-ref: Specify block's noweb reference resolution target
noweb-sep: String used to separate noweb references
cache: Avoid re-evaluating unchanged code blocks
sep: Delimiter for writing tabular results outside Org
hlines: Handle horizontal lines in tables
colnames: Handle column names in tables
rownames: Handle row names in tables
shebang: Make tangled files executable
eval: Limit evaluation of specific code blocks
wrap: Mark source block evaluation results

Additional header arguments are defined on a language-specific basis, see Languages.