WordPress at a glance
action is not described

woocommerce_init action-hook . WC 1.0

Init action.

Usage

add_action( 'woocommerce_init', 'action_function_name_5702' );
function action_function_name_5702(){
	// action...
}

Where the hook is called

WooCommerce::init()
woocommerce_init
woocommerce/includes/class-woocommerce.php 610
do_action( 'woocommerce_init' );

Where in WP core the hook is used WooCommerce

woocommerce/packages/woocommerce-admin/src/Composer/Package.php 54
add_action( 'woocommerce_init', array( __CLASS__, 'check_outdated_wca_plugin' ) );