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臼
臼
臼 (U+81FC) "mortar, joint"
Pronunciations
Pinyin:	jiù
Bopomofo:	ㄐㄧㄡˋ
Gwoyeu Romatzyh:	jiow
Wade–Giles:	chiu4
Cantonese Yale:	káuh, kau
Jyutping:	kau5, kau3
Japanese Kana:	キュウ kyū (on'yomi); うす usu (kun'yomi)
Sino-Korean:	구 gu
Names
Japanese name(s):	臼/うす usu
Hangul:	절구 jeolgu
Stroke order animation

Radical 134 or radical mortar (臼部) meaning "mortar" or "joint" is one of the 29 Kangxi radicals (214 radicals in total) composed of 6 strokes.

In the Kangxi Dictionary, there are 71 characters (out of 49,030) to be found under this radical.

臼 is also the 136th indexing component in the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China, with 𦥑 being its associated indexing component.

Evolution

Small seal script character

Derived characters

Strokes	Characters
+0	臼𦥑
+2	臽臾
+3	臿
+4	舀舁
+5	舂
+6	舃 (=舄) 舄
+7	舅
+8	與
+9	興
+10	舆^SC (=輿 -> 車) 舉
+12	舊
+13	舋 (=釁 -> 酉)

Literature

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.