bn:02020989n
Noun Concept
Categories: Korean mathematics, All articles with vague or ambiguous time, Chinese inventions, Science and technology in China, Mathematical tools
EN
counting rods  Chóu  counting rod  counting rod numerals  rod numeral
EN
Counting rods are small bars, typically 3–14 cm long, that were used by mathematicians for calculation in ancient East Asia. Wikipedia
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EN
Counting rods are small bars, typically 3–14 cm long, that were used by mathematicians for calculation in ancient East Asia. Wikipedia