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In Xhosa and Zulu, the letters c, x and q are clicks. Linguists write them ǀ ǁ ǃ in IPA. Three click types: dental ǀ (soft tongue-tap) lateral ǁ (like calling a horse) alveolar ǃ (sharp pop) Khoisan-origin, picked up by Xhosa and Zulu through centuries of contact.