ー

See also: 一

ー U+30FC, ー KATAKANA-HIRAGANA PROLONGED SOUND MARK ← ・ [U+30FB] Katakana ヽ → [U+30FD]

ｰ U+FF70, ｰ HALFWIDTH KATAKANA-HIRAGANA PROLONGED SOUND MARK ← ｯ [U+FF6F] Halfwidth and Fullwidth Forms ｱ → [U+FF71]

Japanese

Alternative forms

• (emphatic) 〰, 〜

Glyph origin

Said to be from the right side of 引.

Combining form

ー 

1. The long-vowel mark, which marks a long vowel in katakana (and less commonly in hiragana) when placed after a syllable.

Usage notes

• This mark appears as a horizontal line in horizontal writing (横書き) and as a vertical line in vertical writing (縦書き).
• The Japanese names are 長音符 (chōonpu), 音引き (onbiki) or 棒引き (bōbiki)

Further reading

• Chōonpu on Wikipedia.Wikipedia
• 長音符 on the Japanese Wikipedia.Wikipedia ^ja