Wikipedia
Hand-kissing is a gesture indicating courtesy, politeness, respect, admiration or even devotion by one person toward another.
A hand-kiss is initiated by the person receiving the greeting by holding out their hand with the palm facing downward; or by the person giving the greeting, by extending a hand to grasp the recipient's hand. The person kissing bows towards the offered hand and (symbolically) touches the knuckles with their lips, while lightly holding the offered hand. However, the lips do not actually touch the hand in modern tradition. The gesture is short, lasting less than a second.
Hand-kissing has become rare and is mostly restricted to the conservative upper class or diplomats.
In Turkey, Malaysia, Indonesia, and Brunei , hand-kissing is a common way to greet elder people of both genders, primarily the closest relatives (both parents, grandparents, and uncles or aunts) and teachers. Occasionally, after kissing the hand, the greeter will draw the hand to his own forehead.
The hand-kiss is used quite prominently in The Godfather series, as a way to indicate the person who is the Don. It also features in epoch films, such as Dangerous Liaisons.
Usage examples of "hand-kissing".
Yonny Schmidt had been born at a time and place where hand-kissing was unheard of.