◇

◇ U+25C7, ◇ WHITE DIAMOND ← ◆ [U+25C6] Geometric Shapes ◈ → [U+25C8]

See also: ⋄ [U+22C4 DIAMOND OPERATOR], 🝔 [U+1F754 ALCHEMICAL SYMBOL FOR SOAP], and ♢ [U+2662 WHITE DIAMOND SUIT]

Translingual

Symbol

◇

1. (electricity) annunciator
2. (logic) possible

   Coordinate term: □

   • 2009, Logique et analyse, page 193:

     […] obtained by adding the standard modal operators □ (necessity) and ◇ (possibility) to paralogics.