剛 is a Japanese kanji written with 10 strokes, listed here under the keyword “sturdy”. It is built from 岡 (mount) and 刀 (sword). In Remembering the Kanji by James W. Heisig it is frame 2115.
On KumiJi Glyph Explorer, open the parts search and type “mount” + “sword”. 剛 is among the results, together with every other character containing the same shapes.
Open 剛 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.