Variant/corruption of 句, via 口 → 厶. In present form 勹 (“hook”) + 厶.
Also Simplified from 冓 in 购 (from 購) and 沟 (from 溝).
勾 (radical 20 勹+2, 4 strokes, cangjie input 心戈 (PI), four-corner 27720, composition ⿹勹厶)
- hook, join, connect
- 鈎 (钩) (from 鉤) (as variant of 句)
- 沟 (from 溝) 购 (from 購) (as simplified form of 溝)
- KangXi: page 150, character 23
- Dai Kanwa Jiten: character 2500
- Dae Jaweon: page 339, character 13
- Hanyu Da Zidian: volume 1, page 256, character 3
- Unihan data for U+52FE
勾 (Yale gau1, au1, ngau1)
(common “Jōyō” kanji)
勾 (hangeul 구, 귀 (gu, gwi), revised gu, gwi, McCune-Reischauer ku, kwi)
勾 (Pinyin gōu (gou1), gòu (gou4), Wade-Giles kou1, kou4)
勾 (câu, cấu, cú)