In Search Of The Ideal Privacy Icon — Smashing Magazine
Icons are capable of enhancing the content that surrounds them, but they have to be self-explanatory for that to happen. We have icons for things we like (a thumbs up), things we can share (a box topped with an up arrow), and even for protection against malicious online attacks (a shield), but what are the options we have for representing “privacy”?
Source: smashingmagazine.com