- Abacus
ABACUS (Atomic-orbital Based Ab-initio Computation at USTC) is an open-source software package designed for large-scale electronic structure simulations from first principles
- 算盘 - 维基百科，自由的百科全书
在公元前2400年的 巴比伦 就可能有算盘，在公元前五世纪 希腊 的 希罗多德 有纪录 埃及 人有使用，后来其 希腊字 ἄβᾰκος 成为 拉丁文 、英文的 abacus 。
- ABACUS中文 (简体)翻译：剑桥词典 - Cambridge Dictionary
Machines for calculating fixed numerical tasks such as the abacus have existed since antiquity, aiding in computations such as multiplication and division
- Abacus | Definition, History, Origin, Facts | Britannica
Abacus, calculating device, probably of Babylonian origin, that was long important in commerce It is the ancestor of the modern calculating machine and computer The abacus was in universal use in Europe in the Middle Ages, as well as in the Arab world and in Asia
- Amazon. com: Abacus
Abacus，Soroban, Abacus for Adults, Professional 13 Column Abacus for Math with Reset Button，Digits and Educational Learning Tool （9 8 inch） Add to cart
- Abacus Explained — Everything You Need To Know - History Tools
The abacus is one of the oldest calculating devices, used by ancient civilizations globally This comprehensive guide will explain what an abacus is, how it works, its fascinating history, why it remains popular today, and how learning abacus calculation can improve your math skills!
- Abacus - Math is Fun
An abacus has beads that slide on rods It can be used to count, add, subtract, multiply and more Slide 3 beads UP on the right-most column 1 bead UP on the 2nd-from-right
- Abacus - New World Encyclopedia
An abacus (plurals abacuses or abaci), also called a counting frame, is a calculating tool for performing arithmetical processes, often constructed as a wooden frame with beads sliding on wires
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