Word in the form of an abbreviation which is pronounced by sounding the names of its letters in succession and which functions as a part of speech: He MC'd the program; he had his Ph. D.

简字(按字之顺序，以各字第一字母为代表之简略字)。如 MC = Master of ceremonies 节目司仪；Ph. D. = Doctor of Philosophy 哲学博士。