The manipulabilities of the index finger and thumb were investigated in three tip-pinch postures, using three criteria indicating the form and posture of the manipulability ellipse of the linkage model. Archived from the original on Brusati, Celeste; Enenkel, Karl. "isisSends a Message: What Gestures Say About Today's Middle East". The manipulabilities of the index finger and thumb were separately similar across all subjects in tip-pinch postures. "Phylogenomic analyses reveal convergent patterns of adaptive evolution in elephant and human ancestries". Less commonly referred to as the long or tall finger, the digitus medius manus sits in the center of the hand, right between the digitus secondus manus and the ring finger. Tip-pinch, in which the tips of the index finger and thumb pick up and hold a very fine object, plays an important role in the function of the hand. Index finger in Islam edit In Islam raising the index finger signifies the Tawhd which denotes the indivisible oneness of God. "first finger - definition of first finger in English Oxford Dictionaries". Goodman,.; Sterner,. Two famous examples of this are recruiting posters used during World War I by the United Kingdom and the United States. 7 The Arabic verb - which shares the same root as the Arabic word for index finger - means to praise or glorify God by saying: " Subna Allh " ( ). Citation needed Gestures in art edit As an artistic convention, the index finger pointing at the viewer is in the form of a command or summons. The objective of this study was to investigate how human subjects affect manipulabilities of the tips of the index finger and thumb within the flexion/extension plane of the finger in three different tip-pinch postures. The Authority of the Word: Reflecting on Image and Text in Northern Europe.