上じょう線せん

noun

overline; overscore; overbar

A horizontal line drawn above text, used in mathematics, logic, or as a diacritic.

• 数すう学がくでは、繰くり返かえしを示しめすために数すう字じの上うえに上じょう線せんを引ひく。

  In mathematics, an overline is drawn above a digit to indicate repetition.