Radical

10 strokes

筆

bamboo (321a) + wool 毛 (453) = pen 笔

This can also mean “to write” or (when talking about Chinese characters) “a stroke”.

[毛笔 (453) máobǐ writing brush]

[笔记 (272) bǐjì notes (e.g. of meeting)]

A length of bamboo with wool tied around it (to give a good grip) makes a colorful pen. / Teddy cooks up beetroot to make ink for the pen.