What is the difference between Mathematical Bold Capital O and Latin Capital Letter O?

Mathematical Bold Capital O is U+1D40E in the Mathematical Alphanumeric Symbols block. Latin Capital Letter O is U+004F in the Basic Latin block. They are distinct Unicode codepoints and may appear visually similar depending on the font.

What is the HTML entity for Mathematical Bold Capital O?

The HTML entity for Mathematical Bold Capital O (U+1D40E) is 𝐎.

What is the HTML entity for Latin Capital Letter O?

The HTML entity for Latin Capital Letter O (U+004F) is O.

Are Mathematical Bold Capital O and Latin Capital Letter O the same Unicode character?

No. Mathematical Bold Capital O is U+1D40E (decimal 119822) and Latin Capital Letter O is U+004F (decimal 79). They are separate codepoints.

What are the UTF-8 encodings of Mathematical Bold Capital O and Latin Capital Letter O?

Mathematical Bold Capital O (U+1D40E) encodes as F0 9D 90 8E in UTF-8. Latin Capital Letter O (U+004F) encodes as 4F in UTF-8.

Mathematical Bold Capital O vs Latin Capital Letter O

Compare two Unicode characters side by side — encodings, HTML entities, escape sequences, and Unicode properties. Useful for distinguishing visually similar characters like hyphens and dashes, quotation marks, or homoglyphs.

𝐎

Mathematical Bold Capital O

U+1D40E

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Latin Capital Letter O

U+004F

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Property Comparison

Property	Mathematical Bold Capital O	Latin Capital Letter O
Codepoint	`U+1D40E`	`U+004F`
Decimal	`119822`	`79`
HTML Entity	`𝐎`	`O`
HTML Decimal	`𝐎`	`O`
HTML Hex	`𝐎`	`O`
UTF-8	`F0 9D 90 8E`	`4F`
UTF-16	`D8 35 DC 0E`	`00 4F`
UTF-32	`0001D40E`	`0000004F`
CSS Escape	`\1D40E`	`\4F`
JS Escape	`\uD835\uDC0E`	`\u004F`
Python Escape	`\U0001D40E`	`\u004F`
URL Encoded	`%F0%9D%90%8E`	`O`
Category	`Uppercase Letter (Lu)`	`Uppercase Letter (Lu)`
Block	`Mathematical Alphanumeric Symbols`	`Basic Latin`
Script	`Common`	`Latin`
Bidi Class	`L`	`L`
Unicode Version	`3.1`	`1.1`

Rows highlighted in amber differ between the two characters.

Common Comparisons

Frequently confused character pairs.

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