Iconic was an icon system made specifically for the modern
web.
Initially concieved through a
Kickstarter campaign, the icons showcased an entirely new way to think about
iconography on the web. Iconic demonstrated that icons could
be a living, dynamic visual language as opposed to static
imagery. The icons used every ounce of what SVG provided and
blending that with CSS and Javascript.
Iconic was way, way ahead of its time. It become
property of InVision and is now unfortunately offline.
However, you can learn more about it in its
feature on WIRED.