When both the palms in Pataka are joined together we get the Anjali Mudra. In fact in the Indian culture this Mudra is very often used for greeting people.
Viniyoga shloka (in sanskrit) and the meaning :
karyaha shiromukhorastho viniyoganjalirbudhaihi
This mudra is used to offer salutation to the God, Elders, Teachers and a Brahmin. The Anjali mudra is kept above the head to offer salutations to the God. It is kept in front of the face to offer respects to the Teachers and Elders. It is kept in front of the chest to offer pranams to the twice -born or the Brahmin’s.