Final answer:
A keynote typically appears in parentheses, which are used to present nonessential material and downplay the content, in contrast to italics or bold used for titles or emphasis.
Step-by-step explanation:
A keynote is a number or letter that is often used instead of symbols and usually appears in parentheses. Titles of longer works are typically presented in italics, while titles of shorter works are placed within quotation marks. When downplaying content or providing clarifying information, parentheses are used to set off nonessential material, placing less emphasis on the content than dashes or commas. An instance of this usage could be appending a date or source to a statement within scientific or academic writing.
Additionally, it is worth noting that dashes are preferred for adding emphasis or setting off appositive phrases that add explanatory information to the noun preceding it. For example, a parenthetical element might appear as 'The results of the survey (conducted in May 2020) showed...' where the date is supplemental and not central to the statement.