Shiblon is a named unit of measurement given as “half of a senum”. Barley is named with the amount “a shiblon for half a measure of barley” (Alma 11:15).
A shiblum is “a half of a shiblon” (Alma 11:16). An antion of gold is “equal to three shiblons” (Alma 11:19).
A leah is “the half of a shiblum” (Alma 11:17).