The Ballarat hamburger cart is a Ballarat icon, but it’s not the icon I’m talking about. There’s another hamburger icon appearing on responsive mobile websites. You're probably using it without even realising it.
In 2014 mobile overtook desktop as the most common method of online browsing. Around 40% of the world population has an internet connection with over 3 billion internet users and the majority are accessing the internet with mobile phones. Yet surprisingly more than a year later many web design businesses are still designing websites with desktops in mind first and not mobile.