*spoken: A quote is spoken out loud by a character in the text. Use said,
*thought: A character thinks a quote, rather than saying it out loud. Use said.
*written: A character internal to the text has written something that is quoted within the text. Use quotation.
*emph: A word or phrase is in quotation marks in order to emphasize it. Use emph.
*distinct: A word or phrase is in quotes because it is linguistically distinct, so, for instance, it is slang or regional dialect. Use distinct.
*mentioned: A word or phrase is in quotes because the author refers to the word itself, such as in a discussion of its part of speech, rather than using the word. Use mentioned.
*term: A word or phrase is in quotes because it is terminology. For instance, computer terms or scientific language. Use term.
*foreign: A word or phrase is in quotation marks because it does not belong to the predominant language used in the text. Use foreign.
*soCalled: An author uses scare quotes to distance him or herself from a word. Use soCalled.