FrontendUser::getCookieName() 

\nn\t3::FrontendUser()->getCookieName(); 

Get the cookie name of the frontend user cookie. Usually fe_typo_user, unless it has been changed in the LocalConfiguration.

\nn\t3::FrontendUser()->getCookieName();
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return string

Source Code 

public function getCookieName()
{
	if ($cookieName = $GLOBALS['TYPO3_CONF_VARS']['FE']['cookieName'] ?? false) {
		return $cookieName;
	}
	return \nn\t3::Environment()->getLocalConf('FE.cookieName');
}
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