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Touching the nose can indicate that the person has detected a bad smell. It is also common signal from a person who is not telling the truth.
When a person lies, blood vessels in their nose may dilate, making the nose swell or appear redder. The nasal engorgement then causes mast cells to release histamine, which makes the nose itch and so may lead to the person touching or scratching it (this is probably the basis of the Pinocchio story).
Rubbing the finger alongside the nose can indicate disagreement. It may also be a semi-suppressed nose-scratch related to lying.
Pinching the bridge of the nose can show the person is evaluating something, usually negatively and with some frustration.
Fiddling with the nose or pressing it down can just be a habit when the person is thinking.