area code(prefix appended to a telephone number indicating the geographical area) noun [UK: ˈeə.riə kəʊd] [US: ˈe.riə koʊd]
prefix [prefixes](morpheme at the beginning of a word) noun [UK: ˌpriː.ˈfɪks] [US: ˈpriː.fɪks]Even Japanese people make mistakes using the prefixes 'o' and 'go'. = Incluso los japoneses se equivocan en el uso de los prefijos o y go.