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One of the first uses of the symbol (≈) "Approximately equal to." - Alfred Greenhill, in 'Applications of Elliptic Functions'. (1892)
Uploaded a work by Alfred Greenhill from Book: Applications of Elliptic Functions, PDF: https://dn790004.ca.archive.org/0/items/applicationselli00greerich/applicationselli00greerich.pdf with UploadWizard