This is common nomenclature to enhance readability in fields that have a large number of neologisms and proper nouns, such as some technical domains, medicine,

This is common nomenclature to enhance readability in fields that have a large number of neologisms and proper nouns, such as some technical domains, medicine, investment banking, and so on. It's particularly useful when names are in the same language as the base language (e.g. in English "Peter" is easily recognized as a name, but "better fish" means something in the language, but can also be used as a proper noun, so using italics for proper nouns serves to disambiguate the intended meaning).