Subscribe to The Chicago Manual of Style Online
Q. Searching for a guideline for “is known as” turns up two possible punctuation choices for the term/terms that follow. Sometimes the term is enclosed within double quotes; sometimes it lacks any punctuation. How does one decide?
A. Both styles are commonly used. Quotation marks are especially appropriate when the term is a play on words (e.g., the intersection known as “Hollywood & Wine”) or when it might not otherwise be clear where the term begins (e.g., the insect known as the “pleasing fungus beetle”).