An O mark or Marujirushi (Japanese: 丸印) is the name of the symbol "◯" used to represent affirmation in Japan, similar to its Western equivalent of the tick (check mark). Its opposite is the X mark ("×").
Unicode provides various related symbols, including:
| Symbol | Unicode Codepoint (Hex) | Name |
|---|---|---|
| ○ | U+25CB | WHITE CIRCLE |
| ● | U+25CF | BLACK CIRCLE |
| ◯ | U+25EF | LARGE CIRCLE |