艮 gěn
“Kangxi radical 138; trigram ☶; hexagram ䷳”
On its own, an ordinary character; Cantonese gan3. Readings and gloss from the Unicode Unihan database.
Carries Silver
Not a plain transliteration: the component was chosen for its meaning, or the name is older than the system.
The reading drifted: the component is read gěn, the element yín.