Putting your thumb in between your middle and index finger while making a fist is an obscene gesture.
Thumbs up means all is OK. Thumbs down, however, is usually considered a rude gesture.
People beckon one another by extending an arm and making a scratching motion with their fingers.
To hand-signal the number 5, be sure face your palm inwards towards yourself. Facing it outward may be misconstrued for a "moutza".
Yes" and "no" are usually indicated by nodding the head (only once) downwards for yes and upwards for no.
