The katakana syllable ウ (u). Its equivalent in hiragana is う (u). It is the third syllable in the gojūon order; its position is ア行ウ段 (a-gyō u-dan, “row a, section u”).

manicure / applying nail polish / nail polish

愛子, 藍子, 亜依子: a female given name

dropping out of school