The traditional Thai greeting is called the wai. In general, the younger person greets first, by placing the palms together at chest level and bowing slightly. If someone wai to you, it is polite to wai back. In giving or receiving gifts or passing things, Thais ordinarily use the right hand. They place the left hand under the right elbow, and bow the head slightly. - See more at: http://www.expats-moving-and-relocation-guide.com/nonverbal-communication.html/#nonverbalcommunicationinthailand