noun
wits; brains; intellectual capacity
Refers to one's mental sharpness or intellectual resources. Often used in expressions like 知嚢を絞る (to rack one's brains).
彼は知嚢を絞って難問を解いた。
He racked his brains and solved the difficult problem.
この企画には皆の知嚢を集めたい。
I want to gather everyone's wits for this project.
知恵 is the common word for wisdom or intelligence; 知嚢 is a more literary or figurative term for one's store of knowledge or mental resources.
Compound of 知 (chi, 'knowledge') and 嚢 (nō, 'bag' or 'sac'), literally 'bag of knowledge'. The exact historical origin is uncertain, but it is a figurative term for one's intellectual capacity.