shaftment

Etymology
From, from , equivalent to.

Noun

 * 1) An obsolete unit of length defined as 6 inches, which equals 2 palms or $2/3$ span; today 6 inches equals exactly 15.24 cm. (Before the 12th century, a shaftment was defined as $6 1/2$ inches.)
 * 2) Traditionally the width of the fist and outstretched thumb.
 * A shaftment is the width of the palm and the outstretched thumb.