Chōonpu

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	kana - gojūon
n	wa	ra	ya	ma	ha	na	ta	sa	ka	a
tsu	wi	ri		mi	hi	ni	chi	shi	ki	i
゛		ru	yu	mu	fu	nu	tsu	su	ku	u
ー	we	re		me	he	ne	te	se	ke	e
	wo	ro	yo	mo	ho	no	to	so	ko	o

The chōonpu (長音符, chōonpu^?), also known as onbiki (音引き, onbiki^?), bōbiki (棒引き, bōbiki^?), or Katakana-Hiragana Prolonged Sound Mark by the Unicode Consortium, is a Japanese symbol which indicates a chōon, or a long vowel of two moras in length. Its form is a horizontal or vertical line in the center of the text with the width of one kanji or kana character. It is written horizontally in horizontal text and vertically in vertical text. The chōonpu is usually used to indicate a long vowel sound in katakana writing, rarely in hiragana writing, and never in romanized Japanese. The chōonpu is a distinct mark from the dash, and in most Japanese typefaces it can easily be distinguished.

The symbol is sometimes used with hiragana, for example in the signs of ramen restaurants, which are sometimes written らーめん in hiragana. However, usually, hiragana does not use the chōonpu but another vowel kana to express this sound. The following table shows the usual hiragana equivalents used to form a long vowel, using the ha-gyō as an example.

Romaji	Hiragana	Katakana
hā	はあ	ハー
hī	ひい	ヒー
fū (hū)	ふう	フー
hē	へえ	ヘー
hō	ほお	ホー

Note that in Sino-Japanese kanji readings (onyomi), the sounds hē and hō are spelled へい (hei) and ほう (hou) respectively. If such a reading is written in katakana, it would be normally be spelled using ヘイ (hei) and ホウ (hou) as well.

In Unicode, the fullwidth form has the value U+30FC, while the halfwidth form has the value U+FF70, both for horizontal writing.