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(noun) The integrus is the integral (∫) symbol introduced into [mathematics] by Gottfried Wilhelm Leibniz in 1675 CE. Its name is derived from the Latin 'integer' meaning "whole" or "entire," reflecting its [mathematical] purpose of calculating the whole of a quantity, such as areas or volumes under curves, or other total accumulations. The elongated S shape of the integrus originates from the Latin word 'summa' (meaning "sum" or "the addition of"), and it symbolises in the [mathematical] branch of calculus the summation of many infinitesimally small quantities.
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