![](http://www.alamy.com/thumbs/6/40E37306-77FD-4687-AF39-C528F71C2E41/BJW1D3.jpg)
science, mathematics, calculating with finger numbers, image from "Suma" by Luca, 1674,
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Keywords: 17th, alphabet, applied, calculating, century, deaf, finger, fingers, hand, historic, historical, image, language, languages, math, mathematics, maths, numbers, numerical, people, pure, science, series, sign, signal, signs, suma