□

A square outline.

□

1. (geometry) A quadrilateral, usually referred to a square or rectangle.

   □ABCD

   A quadrilateral with vertices named A, B, C, and D in order.

2. A male family member in a family tree. Compare ○ (“a female family member in a family tree”).
3. (logic) logically necessary; provable
4. (astrology) quadrature.
5. (alchemy) salt.
6. See ☐ for a blank ballot.

• ◻

• (logical necessity): ◊

□

1. Used as a placeholder for an unknown hanzi (such as for a dialectal morpheme).
2. Used as a placeholder for an illegible hanzi.

• English: tofu
• Translingual: ⸢ ⸣, [ ]