Leibniz's notation

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What Wikipedia says

In calculus, Leibniz's notation, named in honor of the 17th-century German philosopher and mathematician Gottfried Wilhelm Leibniz, uses the symbols dx and dy to represent infinitely small (or infinitesimal) increments of x and y, respectively, just as Δx and Δy represent finite increments of x and y, respectively.

Excerpt from the Wikipedia article “Leibniz's notation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Johann Friedrich Wentzel, Public domain, via Wikimedia Commons.