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In Japanese writing, the kana 'お' (hiragana) and 'オ' (katakana) occupy the fifth place, between え and か, in the modern Gojūon (五十音) system of collating kana. In the Iroha, they occupy the 27th, between の and く. In the table at right (ordered by columns, from right to left), お lies in the first column (あ行, "column A") and the fifth row (お段, "row O").
The pronunciation of お/オ '' is usually transcribed ; more precisely, it is or .

Form	Rōmaji	Hiragana	Katakana
Normal ''a''/''i''/''u''/''e''/''o'' (あ行 ''a-gyō'')	''o''	お	オ
	''ou'' ''oo'', ''oh'' ''ō''	おう, おぅ おお, おぉ おー	オウ, オゥ オオ, オォ オー

Contents

Derivation

Variant forms

Representations in other writing systems

Derivation

お and オ originate, via man'yōgana, from the kanji 於.

Variant forms

Scaled-down versions of the kana (ぉ, ォ) are used to express morae foreign to the Japanese language, such as フォ (fo).

Representations in other writing systems

★ Braille:

★ :

－● ●－ －－

★ Phonetic alphabet: 「大阪のオ」 ("''o'' as in ''Osaka''")

★ Morse code: ・－・・・