Calculators

thumb|An electronic pocket calculator with a seven-segment display|seven-segment [[liquid-crystal display (LCD) that can perform arithmetic operations]] thumb|upright=.6|A modern scientific calculator with a dot-matrix display

mathematical notation in which every operator follows all of its operands

calculator designed to calculate problems in science, engineering, and mathematics

foreign exchange market

class of mechanical calculator, usually specialized for bookkeeping calculations

Wristwatch with a built-in calculator

method of writing text on seven-segment displays

type of calculator