Radical 72

Radical 72 or radical sun (日部) meaning "sun" or "day" is one of the 34 Kangxi radicals (214 radicals in total) composed of 4 strokes.

In the Kangxi Dictionary, there are 453 characters (out of 49,030) to be found under this radical.

日 is also the 75th indexing component in the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China, with (formerly Kangxi Radical 73 "say") and  being its associated indexing components.

Sinogram
The radical is also used as an independent Chinese character. It is one of the kyōiku kanji or kanji taught in elementary school in Japan. It is a first grade kanji.