Radical 27

Radical 27 or radical cliff meaning "cliff" is one of the 23 Kangxi radicals composed of two strokes.
In the Kangxi Dictionary, there are 129 characters to be found under this radical.
厂 is also the 7th indexing component in the Table of Indexing [Chinese Character Components] predominantly adopted by Simplified [Chinese characters|Simplified Chinese] dictionaries published in mainland China, with ? being its associated indexing component. Though the Chinese character 厂 shares the same form as the simplified form of 廠 which means "factory", the two are historically irrelevant in terms of meanings.