Radical 77

Radical 77 or radical stop (止部) meaning "stop" is one of the 34 Kangxi radicals (214 radicals in total) composed of 4 strokes.

In the Kangxi Dictionary, there are 99 characters (out of 49,030) to be found under this radical.

止 is also the 73rd indexing component in the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China.

Sinogram
As an independent sinogram 止 is a Chinese character. It is one of the kyōiku kanji or kanji taught in elementary school in Japan. It is a second grade kanji.