《汉语拼音方案》 (Scheme for the Chinese Phonetic Alphabet) defines a standard pronunciation for each letter in Hanyu Pinyin with Zhuyin. ㄝ(/ɛ/) typically only occurs in syllables with an initial glide (e.g. ㄧㄝ(-ie/i̯ɛ/)), where it is romanized as e. When it occurs in syllables without an initial glide, however, it is romanized as ê in order to distinguish it from ㄜ(-e/ɤ/). Such instances are rare, and are only found in interjections or neologisms.
