- Does every letter have a circled version?
- Uppercase A–Z and digits 0–9 have full coverage. Lowercase a–z exists for most letters but the glyph quality varies. Punctuation is not circled in standard Unicode.
- Can I use circled text in tweets?
- Yes, and it stands out. Each circled letter is its own codepoint, so it counts as one character in Twitter's limit (same as regular letters).
- Will it work in filenames?
- It will, but most filesystems normalize unicode. The filename may appear different than what you typed. Avoid for important files.
- Is this related to the Copyright © symbol?
- Yes — © is the circled C. The circled-letter series includes full alphabets that follow the same typographic convention.