Radical 143

Radical 143 or radical blood (血部) meaning "blood" is one of the 29 Kangxi radicals (214 radicals in total) composed of 6 strokes.

In the Kangxi Dictionary, there are 60 characters (out of 49,030) to be found under this radical.

血 is also the 138th 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 it is one of the Kyōiku kanji or Kanji taught in elementary school in Japan. Specifically it is a third grade kanji.