It is said that 55-80 per cent of our communication is nonverbal_communication that includes gestures you see below.
When done behind a person’s head means “cuckold” it’s offensive (Italy, Spain and Portugal)
“F*** Off!” (UK, Aus)
In other countries this is means “peace” just like the victory sign
“A***hole” (Brazil, Germany)
This gesture means "one" or "number one". Sign of Approval (US, Western Europe)
This can also mean “Up Yours”, offensive (Middle East, West Africa, South America and Russia)
Crossing the fingers
This means “wishing for good luck or fortune”. Another interpretation could be seen as “here’s hoping”. The gesture was believed to ward off evil.
The thumbs down
Means that something is bad or not accepted. “You failed”.
“Wait” (US and Western Europe in Middle East),
“F***ck You” (Turkey and Greece)
Impolite way of saying “Come here”. For others this means a possible sexual invitation
Open palm-motion downward
It is an authoritarian signal that states “Stop, Sit, or Enough”
Hand up -Palm open
"Stop! Stay away."
Looking at wrist (watch or no watch)
It's a sign of impatience or irritation. It is “time” for the communication to end.
Pointing at people is rude meaning “You!” Depends upon a situation. Sometimes this gesture is use to identify a specific person in the group.
“Live Long and Prosper” used by Spock in Star trek TV series
This gesture can mean “I am going to kill you”. In the US, this can be a gesture of greeting someone
“Technical foul” in sports. In UK “tea break”
“Boring”, “I am not listening”, “You talk a lot”
This gesture is said to curse or to remove a curse. To curse someone, the hand is jabbed forward and the pointed at the heart of the person you want to curse.
Rock music: this is a heavy metal salute
Horn hand twist
The wrist is twisted back and forth. This gesture is used to insult a man because his wife or girlfriend is having an affair (offensive) in Italy and Brazil.
“So you get the idea?” it can also mean "what are you saying?
“I am Listening”
Means confidence. In many cases this is a superior to subordinate hand gesture. It is also a gesture of listening patiently.
The “crooked finger” is seen as an impolite hand gesture. Parents can use it on their child as a gesture meaning “come”. People use this to call a waiter. In some Asian countries it is used for calling a prostitute or calling an animal.
Means Defiance against authority, solidarity and anarchy. According to some, anarchists and protesters raise the right fist and communists the left.
Palm -open and closed
This is a gesture of aggression. "I’m ready for you...come let’s fight! Make the first move....if you are tough enough!"
Universal meaning means “F***ck you!” also called “flipping the bird.”
Just a reminder if you are not sure about the meaning of gestures in a foreign country please do not use them. You might land in jail or somebody might beat you up without you knowing you offended them.