This article relies largely or entirely on a single source. (April 2018)
Dexiosis (Greek δεξίωσις dexiōsis, 'greeting' to δεξιόομαι dexioomai‚ 'to give (someone) the right (hand)' δεξιός, dexios 'right', Latin dextrarum iunctio‚ 'joining together of the right hands'), in the fine arts, is the representation of two people offering each other their right hand.
The dexiosis reliefs from Commagene are well known in which the then ruler is shown shaking hands with gods. Dexiosis reliefs are also known from Roman gravestones, which show the deceased with their spouses  Similarly, dexiosis reliefs are found on ancient coins and are they are intended to show bonds between two cities by shaking hands.
Portrayals of dexiosis are also known from much earlier times on vase paintings.
- http://farms.byu.edu/publications/review/?vol=18&num=1&id=616 Archived 2008-12-21 at the Wayback Machine Stephen D. Ricks, Dexiosis and Dextrarum Iunctio: The Sacred Handclasp in the Classical and Early Christian World
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