#arithmograph

• Arithmograph — An old mechanical apparatus or device used for automatically performing and graphically recording or printing primary arithmetic calculations. In the history of computing technology, the instrument represents an essential intermediate step between the abacus and modern electric calculating machines, used in accounting and statistics during the late 19th and early 20th centuries.
• Arithmography — A rare neologistic term designating the study, description, or graphical representation of numbers and the arithmetic relationships between them. In some historical or occult contexts, it may refer to a method of calculation or symbolic interpretation of texts by converting letters into numerical values, similar to gematria.