To undefined on Talkie: what does ifk mean

(function() { if (!window.isGPCEnabled) { var iframe = document.createElement('iframe'); iframe.src = 'https://www.googletagmanager.com/ns.html?id=GTM-KKJ9VVF5'; iframe.height = '0'; iframe.width = '0'; iframe.style.display = 'none'; iframe.style.visibility = 'hidden'; document.body.appendChild(iframe); } })();