孔 is a Japanese kanji written with 4 strokes, listed here under the keyword “cavity”. It is built from 乙 (fish guts) and 子 (child). In Remembering the Kanji by James W. Heisig it is frame 100.
On KumiJi Glyph Explorer, open the parts search and type “fish guts” + “child”. 孔 is among the results, together with every other character containing the same shapes.
Open 孔 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.