Index finger

indexforefingerfirst fingerfore-fingergesture commonly used by IslamistsIndex finger (digitus II manus)Index finger (digitus secundus manus)one-finger salutepointing fingersecond
The index finger (also referred to as forefinger, first finger, pointer finger, trigger finger, digitus secundus, digitus II, and many other terms), is the second finger of a human hand.wikipedia
219 Related Articles

Finger

fingertipfingersdigits
The index finger (also referred to as forefinger, first finger, pointer finger, trigger finger, digitus secundus, digitus II, and many other terms), is the second finger of a human hand. 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.
The first digit is the thumb, followed by index finger, middle finger, ring finger, and little finger or pinkie.

Digit ratio

2D:4D finger ratiosdigit-length ratiofinger length ratio
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.
The ratio of two digits in particular, the palmar 2nd (index finger) and 4th (ring finger), is affected by exposure to androgens, e.g., testosterone while in the uterus and that this 2D:4D ratio can be considered a crude measure for prenatal androgen exposure, with lower 2D:4D ratios pointing to higher prenatal androgen exposure.

Middle finger

middlethe middle fingerfinger
It is located between the first and third digits, between the thumb and the middle finger.
The middle finger, long finger, or tall finger is the third digit of the human hand, located between the index finger and the ring finger.

Finger-counting

finger countingfingerscount on their fingers
A lone index finger held vertically is often used to represent the number 1 (but finger counting differs across cultures), or when held up or moved side to side (finger-wagging), it can be an admonitory gesture.
In the system mainly used in Continental Europe, the thumb represents 1, the thumb plus the index finger represents 2, and so on, until the thumb plus the index, middle, ring, and little fingers represents 5.

Extensor indicis muscle

extensor indicisextensor indicis propriusindicis
Its tendon goes to the index finger, which it extends.

Hand

handspalmpalms
The index finger (also referred to as forefinger, first finger, pointer finger, trigger finger, digitus secundus, digitus II, and many other terms), is the second finger of a human hand.

Radial artery of index finger

Radialis indicisradialis indicis artery
The radialis indicis artery (radial artery of index finger) is a branch of the radial artery that provides blood to the index finger.

Thumb

opposable thumbopposable thumbsopposable
It is located between the first and third digits, between the thumb and the middle finger. In some countries, particularly the Ethnic Malays in Malaysia, pointing using index finger is rude, hence thumb is used instead.

Ring finger

ringfourth fingerfourth
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.

Indication

indicateindicating
"Index finger" literally means "pointing finger", from the same Latin source as indicate; its anatomical names are "index finger" and "second digit".

Phalanx bone

phalangesphalanxproximal phalanx
The index finger has three phalanges.

Tendon

tendonssinewtendinous
The index finger does not contain any muscles, but is controlled by muscles in the hand by attachments of tendons to the bones.

Number

number systemnumericalnumbers
A lone index finger held vertically is often used to represent the number 1 (but finger counting differs across cultures), or when held up or moved side to side (finger-wagging), it can be an admonitory gesture.

1

oneunitymultiplicative identity
A lone index finger held vertically is often used to represent the number 1 (but finger counting differs across cultures), or when held up or moved side to side (finger-wagging), it can be an admonitory gesture.

American manual alphabet

ASL alphabetmanual alphabetone-handed manual alphabet
With the hand held palm out and the thumb and middle fingers touching, it represents the letter d in the American Sign Language alphabet.

Theory of mind

theory of mind (ToM)theory of the mindtheory of other minds
Pointing in human babies can demonstrate the theory of mind, or ability to understand what other people are thinking.

Malays (ethnic group)

MalayMalaysMalay people
In some countries, particularly the Ethnic Malays in Malaysia, pointing using index finger is rude, hence thumb is used instead.

Malaysia

Federation of MalaysiaMalaysianMalaya
In some countries, particularly the Ethnic Malays in Malaysia, pointing using index finger is rude, hence thumb is used instead.

Tawhid

monotheismOneness of GodTawheed
In Islam raising the index finger signifies the Tawhīd, which denotes the indivisible oneness of God.

Foreign Affairs

Foreign Affairs (magazine)Foreign Affairs JournalForeign Affairs magazine
It is used to express the unity of God ("there is no god but Allah").Sends a Message: What Gestures Say About Today's Middle East |journal=Foreign Affairs |date=3 September 2014 |archivedate=12 August 2015 |url=https://www.foreignaffairs.com/articles/middle-east/2014-09-03/isis-sends-message}}

Tasbih

Subhan AllahTasbeehSubhan'Allah
The Arabic verb سَبَّحَ - which shares the same root as the Arabic word for index finger - means to praise or glorify God by saying: "Subḥāna Allāh" .

Ancient Rome

RomanRomansRome
The Romans used the forefinger while fighting because the index finger asserted that the enemy was in front of them.

Military recruitment

recruitrecruitingrecruits
Two famous examples of this are recruiting posters used during World War I by the United Kingdom and the United States.

World War I

First World WarGreat WarWorld War One
Two famous examples of this are recruiting posters used during World War I by the United Kingdom and the United States.