Un*，这个“*”是右上角标（汉语就读“Un星”了），这个“Un*”用英语怎么表达出来？

Question

Un是一个电压

Answer 1

asterisk

/ ˈæstərɪsk; ˋæstəˏrɪsk/ n
star-shaped symbol (*) used in writing and printing to call attention
to sth, eg a footnote, or to show that letters are omitted, as in Mr J*n*s for Mr Jones 星号（即 *,
用於书写及印刷中以引起注意, 例如有脚注或有省略的字母, 如以Mr J*n*s代表Mr Jones）.
> asterisk
v [Tn] mark (a word, phrase, etc) with an
asterisk 用星号标出（词语等）: The asterisked questions may be
omitted. 带星号的问题可以略去.