He of the books, after hearing the confidential disclosures of Schaunard, had informed him that his name was Gustave Colline; he was a philosopher by profession, and got his living by giving lessons in rhetoric, mathematICs and several other ICs.
"Bohemians of the Latin Quarter"
Henry Murger
143 AcoustICs Names of sciences ending in ICs, are generally regarded as singular.
"Slips of Speech"
John H. Bechtel
104. What does ICs signify?
"1001 Questions and Answers on Orthography and Reading"
B. A. Hathaway