Glossary
Human Hand Fingers Identified By Roman Numerals

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Finger
A digit of a hand, excluding the thumb.
Fingers are named and identified by Roman numerals.
In a pentadactyl (five-fingered or five-toed) arrangement, the most medial digit, if present, is I (e.g. the human thumb) and the most lateral is V (e.g. the human little finger).
Finger Horizontal