(from Lost s03e20 - The Man Behind the Curtain, when Ben arrives on the island)

http://en.wikipedia.org/wiki/Namaste

Taken literally, it means "I bow to you". The word is derived from Sanskrit (namas): to bow, obeisance, reverential salutation, and (te): "to you".

When spoken to another person, it is commonly accompanied by a slight bow made with hands pressed together, palms touching and fingers pointed upwards, in front of the chest. The gesture can also be performed wordlessly and carry the same meaning.