A name given to such coins as present their obverse or reverse types in intaglio. On early Greek coins the design often appears raised on one side, while on the other side it is sunk, or its place taken by a more or less crude punch. The early incuse coins of Magna Graecia usually present the obverse type in intaglio on the reverse. The same is the case with certain mis-strikes of a later period where a similar effect has been produced, because the coin, in the hurry of striking, has remained in the die and has then left its own impress on the succeeding blank or flan.
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)