The term 'Hebrew Dry Measure' refers to three different units of measurement used in the Hebrew Bible. The first is the Ephah (5 letters), which is a unit of dry volume equal to 10 omers or one-tenth of a homer. The second is the Epha (4 letters), which is a unit of dry volume equal to one-tenth of an ephah. The third is the Omer (4 letters), which is a unit of dry volume equal to one-tenth of a homer. All three of these units of measurement are still used today in some parts of the world.