腹 is a Japanese kanji written with 13 strokes, listed here under the keyword “abdomen”. It is built from 复 (fold back) and 月 (month). In Remembering the Kanji by James W. Heisig it is frame 503.
On KumiJi Glyph Explorer, open the parts search and type “fold back” + “month”. 腹 is among the results, together with every other character containing the same shapes.
Open 腹 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.