Palm (unit)
A palm, when used as a unit of length, is usually four digits (fingers) or three inches, i.e. 7.62 cm (for the international inch).
In English this unit is no longer in use as other units that are based on the human arm: digit (¼ palm), finger (7/24 palm), hand (4/3 palms), shaftment (2 palms), span (3 palms), cubit (6 palms) and ell (15 palms).
Palm (unit) Media
Detail of the cubit rod in the Museo Egizio of Turin, showing digit, palm, hand and fist lengths
Sign giving the metric equivalents of the units in use in the 17th century in the covered market of Pernes-les-Fontaines in the Vaucluse
The English palm as the width of four fingers.
