𥒥

𥒥 (Kangxi radical 112, 石+6, 11 strokes, composition ⿰石多)

• Kangxi Dictionary: not present, would follow page 830, character 13
• Unihan data for U+254A5

Phono-semantic compound (形聲 / 形声, đá): semantic 石 (“stone”) + phonetic 多 (đa).

𥒥: Hán Nôm readings: đá

1. chữ Hán form of đá
   1. rock, stone
   2. (by extension) ice as used for consumption or refrigeration
   3. (slang) meth, methamphetamine

• tảng is often used to refer to big rocks, viên to small stones, hòn to mid-sized or small stones/rocks. cục is the colloquial classifier, used for stones and rocks of all sizes, although usually on the smaller side.
• the above "rule" is not always followed.