gesture (n)

He made a rude gesture at the driver of the other car.
She finished what she had to say with a gesture of despair.
They communicated entirely by gesture.
A simple gesture, like a handshake, can convey trust and goodwill.
The gesture of nodding often signifies agreement or understanding.
She made a sweeping gesture to indicate the vastness of the landscape.
In some cultures, a thumbs-up gesture is a positive sign of approval.