the obvious origin that yet does not seem to have been suggested is in the action of the χερνῆτις, the weighing of the portion of wool to be spun, the pensum.
Onians argues that Zeus’s scales (talanta) derive from the spinner’s practice of weighing out her allotted portion of wool—the pensum—making wool the material substrate of mythological fate.
, The origins of European thought about the body, the mind,, 1988thesis