What Ｏ means
It aligns Latin letters with Japanese text grids. Kana (syllabic signs) and kanji (word characters) fill square cells; fullwidth O fills one too. Japanese calls this width zenkaku, meaning fullwidth. Japan's JIS C 6226, established in 1978 and later known as JIS X 0208, included fullwidth forms in a two-byte character set, encoding each character in two bytes. Unicode kept both widths for older text. Chinese and Korean systems use the same convention.
Neutral in layout; stylized in captions.
A login can reject it where the standard-width O is expected.
Part of the collection
Who writes Ｏ
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What it means when someone sends it to you
2 readingsA fullwidth O fits the grid.
Don't confuse it with
1
Questions people ask
1Why does Ｏ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
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How to type or find Ｏ
- Search it as
- fullwidth O · zenkaku O · vaporwave O
- Shows up in
- Anything that takes text · its shape is whatever your font draws
Ｏ\FF2FCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.