As the article and the comments say, it is a gesture rich in context. While there is some common meaning, that meaning can differ based on the situation, the people, the relationships. And if you spend enough time with your team, you'll get to know them and you will understand them, with this gesture or any other. Trying to write up a black and white interpretation of such things is no more effective than it would be if the article was reversed, trying to tell people in India what it means when Americans move their eyebrows.

Just get to know the people you work with -- it will all fall into place.