Side-project I've been running for around 3 months to compile all the different hand and arm gestures seen throughout our world.
Posts span a number of topics such as: -Well-established hand gestures - The Shaka Sign -More niche hand gestures - Fingerstache -Gestures that exist but haven't been identified - Derping -Appearances in the arts - Scream gesture from the Edvard Munch painting --and media - 2 Legit 2 Quit from "Hot Rod" -Technology that uses hand gestures as input - Leap Motion, Myo -Submissions from readers - The Basketball Steeple, Rain Hands
I believe that there is something for everyone on the website and I also believe that there are thousands of hand gestures waiting to be shared and documented.
If you know of any or you just want to have some fun and make one up, fill out the form on http://letshandit.org/submit/.