Radical 90 or radical half tree trunk (爿部) meaning "half of a tree trunk" or "split wood" is 1 of 34 Kangxi radicals (214 radicals total) composed of 4 strokes.

In the Kangxi Dictionary, there are 48 characters (out of 49,030) to be found under this radical.

In the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China, 爿 is listed as the associated indexing component under the 45th principal indexing component 丬. However, the character 爿 itself and 爿 as in some other characters (e.g. 戕, 寐, etc.) are not simplified. Similar inconsistency can also be found in Japanese shinjitai.

• Oracle bone script character

• Fazzioli, Edoardo (1987). Chinese calligraphy : from pictograph to ideogram : the history of 214 essential Chinese/Japanese characters. calligraphy by Rebecca Hon Ko. New York: Abbeville Press. ISBN 0-89659-774-1.
• Lunde, Ken (Jan 5, 2009). "Appendix J: Japanese Character Sets" (PDF). CJKV Information Processing: Chinese, Japanese, Korean & Vietnamese Computing (Second ed.). Sebastopol, Calif.: O'Reilly Media. ISBN 978-0-596-51447-1.

Wikimedia Commons has media related to Radical 090.

• Unihan Database - U+723F