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a specialized calculator designed for solving complex mathematical and scientific equations, commonly used by students, engineers, and scientists
科学计算器
a type of calculator equipped with a built-in printer that produces a physical record of calculations
打印计算器
a type of calculator that allows users to write and execute customized programs to automate complex calculations
可编程计算器
a type of calculator that operates on a postfix notation system, where operators follow their operands, offering simplicity and efficiency in engineering and scientific calculations
RPN计算器
a device that performs arithmetic operations through mechanical means, often using gears, levers, and other physical mechanisms, predating electronic calculators
机械计算器
a mechanical or electronic device designed for performing arithmetic operations such as addition, subtraction, multiplication, and division
计算机器
a tool used for counting and calculating that consists of a frame with rods or wires on which beads or stones are moved up and down using hands
算盘
a set of numbered rods used for multiplication and division, invented by John Napier in the 17th century
纳皮尔的骨头
a manual calculating tool with rows of beads or counters on rods or wires used for basic arithmetic operations
算盘
a tool with marked rods or sticks used in ancient math, especially in Chinese and Japanese traditions
计数棒
a mechanical calculator developed in the late 19th century, featuring multiple rows of keys corresponding to digits
计算机计
a mechanical calculator designed by Charles Babbage in the 19th century, intended to perform mathematical calculations automatically by the method of finite differences, considered a precursor to modern computers
差分机
an early mechanical calculator invented by Blaise Pascal in the 17th century, capable of performing addition and subtraction through gear mechanisms, considered one of the first mechanical calculators
帕斯卡林
a compact, hand-cranked mechanical calculator invented by Curt Herzstark in the 1940s, renowned for its innovative design and portability, capable of performing complex arithmetic calculations
库尔塔
