See also: Appendix:Variations of "u"
ǜ U+01DC, ǜ
LATIN SMALL LETTER U WITH DIAERESIS AND GRAVE
Composition:u [U+0075] + ◌̈ [U+0308] + ◌̀ [U+0300]
← Ǜ
[U+01DB] 		Latin Extended-B ǝ →
[U+01DD]

Mandarin

Romanization

ǜ (ü4, Zhuyin ㄩˋ)

  1. (Hanyu Pinyin) The letter ü in the fourth tone.
source: https://en.wiktionary.org/wiki/%C7%9C