Peace I leave with you, My peace I give to you; not as the world gives do I give to you.
Let not your heart be trou­bled, nei­ther let it be afraid.

~John 14:27

(Miraculous icon of Christ Pantocrator, XIV century, Pskov, Russia

Hand gesture is the Christogram, (The Greek letters IC XC) common in many Orthodox icons. It is an abbreviation for the name of Jesus Christ. While it is similar, it is not the same as a Buddhist mudra, and it is not warding off evil, but giving a blessing.  To clarify:

Symbolism of the Blessing
The fingers spell out “IC XC”, a widely used four letter abbreviation of the Greek for Jesus (IHCOYC) Christ (XPICTOC). It is by the name of Jesus that we are saved and receive blessings: “At the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth;” (Phil 2:10).

The three fingers of Christ – as well as spelling out “I” and “X” – confess the Tri-unity of God: Father, Son and Holy Spirit. The touching finger and thumb of Jesus not only spell out “C”, but attest to the Incarnation: to the joining of divine and human natures found in the body of Jesus Christ.”