gèn gèn — Kangxi radical 138; the trigram for mountain, also "stubborn"

Forms

• 艮 top — 作上部件时（如「垦」「恳」）末笔捺写成点。

Characters that use it as a component

良垦很恨恳根狠痕

Characters filed under it as a radical

Kangxi radical no.138 · 6strokes — The 214 Kangxi radicals

Filed under it in a dictionary. That is a lookup convention — it does not mean it is the only part the character is built from.

良