𝒬

𝒬 U+1D4AC, 𝒬 MATHEMATICAL SCRIPT CAPITAL Q [unassigned: U+1D4AD] ← 𝒫 [U+1D4AB] Mathematical Alphanumeric Symbols 𝒮 → [U+1D4AE]

The alchemical symbol can be rather abstract.

Translingual

Symbol

𝒬

1. (alchemy, archaic) abbreviation for quintessence, quinta essentia

   Synonyms: QE, q̄, ē

2. (phonetics, obsolete) letter in Doke (1925) for a voiced alveolar click (presumably inspired by the letter Q for the alveolar clicks in Zulu and Xhosa)