As a symbol, a finger can have several meanings. In the Bible, e.g., a finger is a symbol of power, just like the hand is. Similarly, a finger can be a symbol of magical power.

Fingers can also symbolize insults, as is the case, e.g., in showing somebody the middle finger of an upside down hand ('flipping the bird').

Pointing the finger is often done to cast blame for something (on somebody else).