||This article needs additional citations for verification. (April 2013)|
|Human hand with index finger extended|
|Latin||Digitus II manus, digitus secundus manus, indicis|
|Artery||Radial artery of index finger,
proper palmar digital arteries,
dorsal digital arteries
|Vein||Palmar digital veins, dorsal digital veins|
|Nerve||Dorsal digital nerves of radial nerve, proper palmar digital nerves of median nerve|
The index finger, (also referred to as forefinger, pointer finger, trigger finger, digitus secundus, digitus II, and many other terms), is the first finger and the second digit of a human hand. It is located between the first and third digits, between the thumb and the middle finger. It is usually the most dextrous and sensitive finger of the hand, though not the longest – it is shorter than the middle finger, and may be shorter or longer than the ring finger – see digit ratio.
A lone index finger held vertically is often used to represent the number 1, or when held up or moved side to side (finger-wagging), it can be an admonitory gesture. With the hand held palm out and the thumb and middle fingers touching, it represents the letter d in the American Sign Language alphabet. In sports, it can also represent victory, as some championship-winning teams raise their index finger (often saying "We're number one!") while posing for a championship team photo – oversized foam hands with a single upraised index are also used for this purpose; compare with the victory sign. Many between 2 and 12 years of age find the index finger particularly useful for "picking" their nose. This is done when the index finger is thrust upward into the nasal passage. For the vast majority of computer users, it is the finger most often used to click a mouse, as well as the finger used in the untrained 'hunt and peck' Typing style.
Pointing with index finger may be used to indicate an item or person. Pointing one's index finger at a person is considered rude in certain cultures. A more polite way to indicate another person would be to raise a hand in their direction, as if holding a platter.
Around the age of one year, babies begin pointing to communicate relatively complex thoughts, including interest, desire, information, and more. Pointing in human babies can demonstrate the theory of mind, or ability to understand what other people are thinking. This gesture may form one basis for the development of human language. Non-human primates, lacking the ability to formulate ideas about what others are thinking, use pointing in much less complex ways.
See also 
- Gary Imai. "Gestures: Body Language and Nonverbal Communication". Retrieved 12 November 2009.
- Day, Nicholas (26 March 2013). "Research on babies and pointing reveals the action’s importance". Slate. Retrieved 25 April 2013.
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