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- Chacha (brandy), a Georgian grape vodka or moonshine
- ChaCha (search engine), a search engine with a guided search function
- ChaCha (cipher), a stream cipher
- HTC ChaCha, Android smartphone by HTC
- Cha-Cha, a method of creating stereo images by moving one camera along a sliding baseline
- Short for the Philippines charter change
- Chacha language, the name sometimes given to the language of the Chachapoya people
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