Italics is used in a variety of cases.
Titles of books, reports, webpages, and other stand-alone works
First use of key terms or phrases, often accompanied by a definition
Titles of books, reports, webpages, and other stand-alone works
Titles of periodicals and periodical volume numbers (but not the comma between them)
English letters used as statistical symbols or algebraic variables
Anchors of a scale (but not the associated number)
First use of words, phrases, or abbreviations from another language when readers may not be familiar with them; however, if the term appears in a dictionary for the language in which you are writing, do not italicize it.