Top bamboo radical - the compressed cap form of
竹, two stylized bamboo leaves pointing down. The indexing radical, files
笠 in the bamboo-product family:
笔 brush,
笑 laugh (bamboo bowing in the wind),
第 ordinal,
答 answer,
篱 fence,
筷 chopsticks. Marks
笠 as a bamboo-craft object - specifically a wide woven rain-hat (
斗笠 the iconic conical farmer's hat).