筆 is a traditional Chinese hanzi, listed here under the keyword “writing brush”. It is built from 竹 (bamboo) and 聿 (writing brush). It appears as a component in 1 other character in this index.
On KumiJi Glyph Explorer, open the parts search and type “bamboo” + “writing brush”. 筆 is among the results, together with every other character containing the same shapes.
Open 筆 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.