In Japan, the symbol for asking someone to come near you is almost the same as the Western hand gesture to wave goodbye. With your palm facing who you would like to join you, bend all fingers except your thumb. This can be confusing to many westerners as they believe coworkers are telling them goodbye when the coworker is actually requesting their presents. Also, if someone were to bend their index finger to tell another person to come closer, in Japan, that action would be considered obscene and almost hostile.
Another American way of calling people of is with the palm up and bending all the fingers. In Japan, this can also be seen as rude as this signal is used only to call animals, such as dogs, and should not be used to call over human beings. Not only is it impolite, it is entirely inappropriate for any human being in Japanese culture.