= mesolabe, n.

An instrument used for finding lines that are mean proportionals.

A device consisting of cords or threads of different colours arranged and knotted in various ways, used originally by the Incas of Peru and the…

In plural. Mathematics = Napier's bones, n. Occasionally in singular: each of the sticks making up a set of Napier's bones. Now historical.

Several narrow rods or strips of bone, ivory, wood, or other solid material, divided into compartments marked with certain digits, and formerly used…

= Napier's bones, n.

An aid to reckoning.

An apparatus for keeping count of revolutions, strokes of a piston, etc.

A mechanical or electromechanical apparatus for adding up numbers. Cf. adder, n.2 2.

An apparatus for registering the number of revolutions, strokes, or cycles of a mechanism, esp. in a manufacturing process.

= rod, n.1 9b.

A self-contained adding machine. Now historical.

A device or machine for performing or facilitating calculation.

An instrument for working out arithmetical problems.

a gauge for ascertaining the coarseness or fineness of the perforations of a stamp (usually expressed as the number of perforations in two…

One of a set of wooden rods of different length and colour according to the number they represent, invented by Cuisenaire as an aid in the teaching…

a graduated line representing the ordered set of real numbers (sometimes only the set of integers or natural numbers), used esp. to illustrate…

A computer or software capable of performing rapid calculations with large amounts of data.

colloquial. A person, machine, or system with a capacity for performing complex or lengthy operations with numerical data, computer code, etc…