Hamburger menu

• http://techcrunch.com/2014/05/24/before-the-hamburger-button-kills-you/
• http://www.bbc.com/news/magazine-31602745

Character choice

https://www.ecb.europa.eu/

.ico-bars:before, #ecb-mobileNavToggle:before {
    content: "\f0c9";
}