One hand wiggling as it travels up an arm, like a lizard climbing a wall.
Many signs have developed via local deaf communities, so like spoken language we have regional dialects for signing. And the vocabulary is far from complete.
What's cool is that you can sign the Cambodian alphabet, so it actually is possible to spell a word if you're stuck. (Intimidated by written Khmer? Imagine signing it! Far out.)
First-time visitors are usually assigned a 'sign name' based on their personal characteristics. That's kind of fun. You can see what I am above. Tags: sign language, Cambodia