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aes
This term refers specifically to the copper or bronze alloy used for coinage in ancient Rome. It is a technical term used primarily in numismatics and classical history to distinguish between different metallic standards of currency, such as the distinction between gold (aurum) and bronze (aes).
Because it is a Latin loanword used as a specialized term for a specific material in a historical context, it is treated as an uncountable mass noun. It does not function as a common English word in everyday conversation but appears in academic texts discussing Roman economic history.