Each letter in an initialism corresponds to one morpheme, that is, one syllable. When the first letter of a syllable has a tone mark or other diacritic, the diacritic may be omitted from the initialism, for example "ĐNA" or "ĐNÁ" for "" (Southeast Asia) and "LMCA" or "LMCÂ" for "Liên minh châu Âu" (European Union). The letter "Ư" is often replaced by "W" in initialisms to avoid confusion with "U", for example "UBTWMTTQVN" or "UBTƯMTTQVN" for "Ủy ban Trung ương Mặt trận Tổ quốc Việt Nam" (Central Committee of the Vietnamese Fatherland Front).