Radical 13 or radical down box (冂部), meaning upside-down box or wide, is one of 23 of the 214 Kangxi radicals that are composed of 2 strokes.

In the Kangxi Dictionary, there are 50 characters (out of 49,030) to be found under this radical.

冂 is also the 10th indexing component in the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China.

• Bronze script character
• Large seal script character
• Small seal 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.
• Leyi Li: “Tracing the Roots of Chinese Characters: 500 Cases”. Beijing 1993, ISBN 978-7-5619-0204-2
• KangXi: page 128, character 30
• Dai Kanwa Jiten: character 1506
• Dae Jaweon: page 289, character 9
• Hanyu Da Zidian: volume 1, page 96, character 13

Wikimedia Commons has media related to Radical 013.

• Unihan data for U+5182