Unicode alphabet

Bold Letter O

Copy the exact output for O/o, check its Unicode code point, and see whether this style preserves case or maps both forms to one symbol.

𝐎Input: uppercase O

𝐨Input: lowercase o

Case behavior: Uppercase O maps to 𝐎 and lowercase o maps to 𝐨. The two cases remain distinct in this style.

Unicode details for Bold O

Input	Output	Mapping	Code point(s)	HTML entity
O	𝐎	Distinct uppercase mapping	U+1D40E	𝐎
o	𝐨	Distinct lowercase mapping	U+1D428	𝐨

Unicode alphabet. This style substitutes supported Latin letters, and digits when the set includes them, with assigned Unicode mathematical or letterlike characters. Unsupported characters stay unchanged. It is a character substitution, not CSS formatting or an installed font.

About this Bold O mapping

Bold O uses separate Mathematical Bold uppercase and lowercase characters. It is a case-preserving mathematical alphabet mapping rather than a visual weight applied to ordinary O/o.

Bold examples for words beginning with O

The source words below begin with ordinary O. Copy the transformed result you want; effects such as Upside Down can also reorder a whole word.

𝐨𝐧𝐲𝐱Source: onyx

𝐨𝐫𝐛𝐢𝐭Source: orbit

𝐨𝐜𝐞𝐚𝐧Source: ocean

𝐨𝐚𝐤Source: oak

𝐨𝐫𝐚𝐜𝐥𝐞Source: oracle

𝐨𝐝𝐲𝐬𝐬𝐞𝐲Source: odyssey

𝐨𝐩𝐚𝐥Source: opal

𝐨𝐮𝐭𝐥𝐚𝐰Source: outlaw

Want to type a full word? Open the Bold generator to transform your own text. To compare this same letter across the whole indexed set, see O in different fonts, or use the alphabet below to inspect another letter in Bold.

Bold A to Z

𝐚 𝐛 𝐜 𝐝 𝐞 𝐟 𝐠 𝐡 𝐢 𝐣 𝐤 𝐥 𝐦 𝐧 𝐨 𝐩 𝐪 𝐫 𝐬 𝐭 𝐮 𝐯 𝐰 𝐱 𝐲 𝐳

Compare O in related styles

These alternatives were selected to show a useful contrast in weight, enclosure, spacing or case behavior.

𝗢Sans Bold OCompare Unicode mapping and case behavior.𝑶Bold Italic OCompare Unicode mapping and case behavior.𝑂Italic OCompare Unicode mapping and case behavior.ᴏSmall Caps OCompare Unicode mapping and case behavior.𝕆Double Struck OCompare Unicode mapping and case behavior.

FAQ

Why can the same Unicode letter look different on another device?

The code point stays the same, but the receiving operating system or app chooses the font that draws it. Shape, weight, spacing or fallback rendering can therefore vary even when the copied character itself has not changed.

What is the Bold letter O?

For uppercase O, Stylish Font Generator outputs 𝐎 (U+1D40E). For lowercase o, it outputs 𝐨 (U+1D428). Uppercase O maps to 𝐎 and lowercase o maps to 𝐨. The two cases remain distinct in this style.

Do uppercase O and lowercase o stay different in Bold?

Uppercase O maps to 𝐎 and lowercase o maps to 𝐨. The two cases remain distinct in this style.

How do I copy and use 𝐎?

Use the Copy button above, paste the result into the field you want, and verify it before saving. Unicode support, fonts, moderation filters and character limits can differ between apps and devices.