What 𝕠 means
As of 2026, in Word for Windows, enter 1D560, then press Alt+X. If adjacent text is hexadecimal, select only the code before the shortcut.
What does 𝕠 mean?
It is a lowercase o in mathematical double-struck style.
The style grew from doubling strokes on a blackboard to make a letter look bold when bold chalk was unavailable; mathematical printers later carried the distinction into type. Familiar double-struck capitals label standard number sets, but this lowercase letter has no standard meaning by itself: read it by the author's definition in its formula.
Part of the collection
Don't confuse it with
1
Questions people ask
1Can normalization turn 𝕠 into plain o?
Yes. Unicode compatibility normalization such as NFKC or NFKD maps this mathematical letter to ordinary Latin o, so systems using it can erase the style distinction. NFC does not apply that compatibility mapping.
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How to type or find 𝕠
- Search it as
- double-struck · blackboard bold · mathbb
- Shows up in
- Anything that takes text · its shape is whatever your font draws
𝕠\1D5601D560, then press Alt+X. If adjacent text is hexadecimal, select only the code first.\mathbb{o} needs a font with lowercase double-struck letters. The American Mathematical Society (AMS) font set supplies capitals; the bbold package includes lowercase.Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.