柊 is a Japanese kanji written with 9 strokes, listed here under the keyword “holly”. It is built from 冬 (winter) and 木 (tree). In Remembering the Kanji by James W. Heisig it is frame 2548.
On KumiJi Glyph Explorer, open the parts search and type “winter” + “tree”. 柊 is among the results, together with every other character containing the same shapes.
Open 柊 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.