忌 is a Japanese kanji written with 7 strokes, listed here under the keyword “mourning”. It is built from 己 (self) and 心 (heart). In Remembering the Kanji by James W. Heisig it is frame 644.
On KumiJi Glyph Explorer, open the parts search and type “self” + “heart”. 忌 is among the results, together with every other character containing the same shapes.
Open 忌 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.