Radical 155

Radical 155 or radical red meaning "red" or "" is one of the 20 Kangxi radicals composed of 7 strokes.
In the Kangxi Dictionary, there are 31 characters to be found under this radical.
赤 is also the 151st indexing component in the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China.

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