息 is a Japanese kanji written with 10 strokes, listed here under the keyword “breath”. It is built from 自 (oneself) and 心 (heart). In Remembering the Kanji by James W. Heisig it is frame 657.
On KumiJi Glyph Explorer, open the parts search and type “oneself” + “heart”. 息 is among the results, together with every other character containing the same shapes.
Open 息 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.