ー

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See also: 一

ー	U+30FC, ー KATAKANA-HIRAGANA PROLONGED SOUND MARK

ｰ	U+FF70, ｰ HALFWIDTH KATAKANA-HIRAGANA PROLONGED SOUND MARK

Halfwidth and Fullwidth Forms

Japanese

Alternative forms

(emphatic) 〰, 〜

Glyph origin

Said to be from the right side of 引.

Combining form

ー

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).
- タクシー (takushī, “taxi”) when written vertically appears as:
  タクシー
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

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