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Handshake ​---> A handshake is a globally widespread, brief greeting or parting tradition in which two people grasp one of each other's hands, and in most cases, it is accompanied by a brief up-and-down movement of the grasped hands. Customs surrounding handshakes are specific to cultures. In America this is a formal and universal way to greet men & women to show respect. 

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Handshake and grabbing arm ---> It is a sign of respect to grasp the right arm with the left hand when shaking hands. It is considered disrespectful to put the free hand in one's pocket while shaking hands.

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Handshake & a one armed hug AKA The Bro Hug ---> This handshake-hug is a sign of acceptance. 

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Hug ---> Hugging is a common greeting ​for many cultures across the world, but is generally ​used as a sign of affection between friends and families. So, unless you really know the person, this greeting is best left for friends outside the office. ​​​

​A greeting hug is a form of nonverbal communication that can convey a variety of meanings, including "hello" or "goodbye". Hugs can also indicate friendliness, support, or comfort, and can be a sign of affection, love, or compassion. The type of hug, its length, and the context in which it's given can all contribute to its meaning:

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The dab/Fist bump --->  A fist bump is a gesture that can have multiple meanings, including greeting, friendship, triumph, respect, approval, or companionship. A fist bump is a gesture that can be used as a greeting, to show friendship, or to express triumph. It involves two people making fists and bumping knuckles together

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Elbow bump --->  a friendly greeting in which you touch someone's elbow (= the place where the arm bends) with your elbow:​

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Kiss on the cheek ---> Americans do not generally do this with people we just meet for the first time. This is more of a European or Latin custom. ​

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Bowing ---> Not typical in American culture. More common in Asia and especially Japanese culture. 

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External Links : 

https://dictionary.cambridge.org/us/dictionary/english/elbow-bump#google_vignette