A barcode is an encoding tag or label that is placed on all products that allow computers, scanners and mobile devices to track and find these products much faster.
Demo: https://yithemes.com/themes/plugins/yith-woocommerce-barcodes-and-qr-codes/
Now you can add a Barcode or QR Code to new and existing orders within WooCommerce. The barcode or QR Code is added below the order details for both the web and email forms.