凵 kǎn open box
Made with 2 strokes.
Picture of a box without a lid
Ancient small seal form 

Sounds same
坎 kǎn (Water) ; 坎 kǎnDifferent tone
刊 kān (to print) ; 看 kàn (look)Radical
Index 17 used in: 出 chū (go out) ; 画 huà (to draw) ; 凶 xiōng (vicious)
Stroke order for character 凵, kindly provided under Wikimedia creative commons license ➚