The four digits of the hand excluding the thumb; extensions used for grasping, touching, and manipulating objects.
From Old English 'finger,' related to German 'Finger' and ultimately from Proto-Indo-European root meaning 'five' (penkwe). The connection to 'five' reflects the fundamental role of fingers in counting systems. Most Indo-European languages have similar words derived from this root.
Our fingers are so central to human cognition that we use finger-based metaphors constantly: 'putting your finger on' a problem, having something 'at your fingertips,' or giving someone 'the finger.' The phrase 'rule of thumb' literally comes from using the thumb as a rough measuring device, showing how our digits became our first tools for understanding the world.
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