Index finger The index is the finger second finger 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. "" literally means "pointing finger", from the same Latin source as ; its anatomical names are "index finger" and "second digit". AnatomyThe index finger has three phalanges. The index finger does not contain any muscles, but is controlled by muscles in the hand by attachments of tendons to the bones. UsesA lone index finger held vertically is often used to represent the number 1, or when held up or moved side to side, 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. PointingPointing with index finger may be used to indicate an item or person. 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. However, dogs and elephants do understand finger pointing. In some countries, particularly the Ethnic Malays in Malaysia, pointing using index finger is rude, hence thumb is used instead. GreetingIn the Netherlands sticking up your index finger with your palm faced towards someone is a greeting. Index finger in IslamIn Islam raising the index finger signifies the Tawhīd, which denotes the indivisible oneness of God. It is used to express the unity of God. In Arabic, the index or fore finger is called musabbiḥa, mostly used with the definite article: al-musabbiḥa. Sometimes also as-sabbāḥa is used. 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".s used the index finger while fighting because the index finger asserted that the enemy was in front of them. Gestures in artAs an artistic convention, the index finger pointing at the viewer is in the form of a command or summons. Two famous examples of this are recruiting posters used during World War I by the United Kingdom and the United States. The index finger pointing up is a sign of teaching authority. This is shown in the depiction of Plato in the School of Athens by Raphael.
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