kanji 'door' radical (戸)
Refers to the kanji radical 戸, often called とかんむり when it appears at the top of a character, though it is not a true crown radical. Used in kanji study and dictionary contexts.
The radical of 所 is とかんむり.
I look up characters with the とかんむり radical in a kanji dictionary.
The name 戸冠 combines 戸 (door) and 冠 (crown), referring to the radical's position at the top of some kanji, though it is not a true 'crown' radical in the traditional sense.