One-face-owners; and each owner has one face; in the Treatise, a ritual name for human fingers
(Atenango, between Mexico City and Acapulco, 1629) Hernando Ruiz de Alarcón, Treatise on the Heathen Superstitions That Today Live Among the Indians Native to This New Spain, 1629, eds. and transl. J. Richard Andrews and Ross Hassig (Norman and London: University of Oklahoma Press, 1984), 221.
the distance between the tip of the thumb and the tip of the index finger (a measure); literally, one fingernail length (but it is really longer if the fingers are spread apart)