二重線(にじゅうせん)

Etymology

二重(にじゅう) (double) + 線(せん) (line).

Cultural note

On official documents in Japan, correction fluid (修正液(しゅうせいえき)) or erasers are not accepted for corrections. Instead, the proper method is to draw 二重線(にじゅうせん) through the error and stamp a 訂正印(ていせいいん) (correction seal).

The 二重線(にじゅうせん) is drawn with a ruler for neatness. The original text should remain legible beneath the lines — the point is to show what was corrected, not to hide it.