□

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.

   Antonym: ○

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 illegible hanzi or lacuna.
2. Used as a placeholder for an unknown hanzi (as when discussing dialectal morphemes).
3. (Internet slang) Used in self-censorship of sensitive characters.

   alt. forms: 口 (kǒu)

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