Nomisma Sign

It marks Byzantine money or a coin-based weight standard. The nomisma was the empire’s standard gold coin; Latin writers called it the solidus. Egyptian papyrus records—written documents on plant-fiber sheets—use the sign for sums; on weights, it identifies the coin standard.

Surviving late Roman and early Byzantine weights bearing it date to the 4th–6th century. Historical forms place the Greek letters omicron and nu differently; a font without this rare glyph may show a box.