Bold Letter O Copy Paste
Copy the bold Unicode letter o in four styles below.
Lowercase o
𝐨
Uppercase O
𝐎
Bold lowercase o
𝗼
Bold uppercase O
𝗢
The bold letter o comes from the Mathematical Alphanumeric Symbols block (U+1D400–U+1D433), a range the Unicode Consortium defined for bold math variables. Applied to a single letter, it reads as a heavier weight character you can drop into any bio or caption without any real formatting.
Need the whole alphabet or a full sentence? Use the bold text generator to convert entire words at once, or browse the italic text generator for a different style.