locus clas·si·cus 
(klăsĭ-kəs)
(klăsĭ-kəs)n. pl. loci clas·si·ci (klăsĭ-sī′, -kī′)
A passage from a classic or standard work that is cited as an illustration or instance.
[New Latin : Latin locus, place + Latin classicus, belonging to the highest class.]