Traditionally, a sign that everything is OK.Or, if you're deaf, it means hello.
Or if you're Australian, it is more of a crocodile pacification technique.
If you're a Roman Emperor, it means, "Okay gladiator one, you can let gladiator two live." The opposite gesture, thumbs-down, means, "Gladiator two bores me. I'd rather watch carrion feast on his flesh than watch him fight and lose again."
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