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FAV is an abbreviation of the word quot; Favorite quot; in English that means favorite. It is a button that is usually pressed on Twitter to vote as favorite in the polls. RT is an abbreviation of quot; ReTweet quot; in English that means to make a peep. Tweet is the voice of the birds in English, so the symbol and Twitter icon is a bird. When you press this button serves to forward the message from another person to someone else.