Registry::fluidNamespace() 

\nn\t3::Registry()->fluidNamespace($referenceNames = [], $namespaces = []); 

Register global namespace for Fluid. Mostly used in ext_localconf.php.

\nn\t3::Registry()->fluidNamespace( 'nn', 'Nng\Nnsite\ViewHelpers' );
\nn\t3::Registry()->fluidNamespace( ['nn', 'nng'], 'Nng\Nnsite\ViewHelpers' );
\nn\t3::Registry()->fluidNamespace( ['nn', 'nng'], ['Nng\Nnsite\ViewHelpers', 'Other\Namespace\Fallback'] );
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| @return void

Source Code 

public function fluidNamespace ( $referenceNames = [], $namespaces = [] )
{
	if (is_string($referenceNames)) $referenceNames = [$referenceNames];
	if (is_string($namespaces)) $namespaces = [$namespaces];
	foreach ($referenceNames as $key) {
		$GLOBALS['TYPO3_CONF_VARS']['SYS']['fluid']['namespaces'][$key] = $namespaces;
	}
}
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