2indexing radical for a small group of characters; readable as pǐ (bolt of cloth, archaic for 匹) or shū (foot)
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history
疋 is an archaic variant of 匹 (a bolt of cloth) and was also read shū to mean 'foot'. Today its main job is dictionary indexing — almost no learner ever writes 疋 as a standalone word.
usage
The two characters most often filed under 疋 are 疏 (shū, sparse / to dredge) and 疑 (yí, to doubt). Both keep 疋 on one side as a structural component without an obvious meaning link.
Radical
Bolt Of ClothKangxi #103
Tiny indexing radical. In modern usage 疋 has been superseded by 匹 for 'bolt of cloth' and rarely stands alone. Mostly a Kangxi bookkeeping slot — its main learner-relevant compounds (疏, 疑) carry it for shape rather than meaning.