The matrix is an "original die": indeed it has its design in the same sense as a die. The design is incised into the matrix, which is used to create punches. Creation of a matrix addresses the basic problem for coinage of multiplying dies, i.e. having enough accurate copies of dies to produce long runs of essentially identical coins. The creation of a master punch from a matrix is called "hobbing".
In contrast, a patrix is a type of master punch with a design in relief, used to create dies.
- Billing, Archibald (1875). The Science of Gems, Jewels, Coins, and Medals, Ancient and Modern. Daldy & Hill. p. 94. Retrieved 18 June 2018.
- Mechanic's Magazine, Museum, Register, Journal & Gazette. Knight and Lacey. 1834. p. 188.
- Salzano, Tammi (2009). Deluxe Canadian coin collecting album. Scholastic Canada. p. 33. ISBN 9780545177399.
- Courtney, Yolanda C. S.; Britain), Royal Numismatic Society (Great (2004). Public house tokens in England and Wales c.1830-c.1920. Royal Numismatic Society. p. 117. ISBN 9780901405784.