The C-circumflex reference article from the English Wikipedia on 24-Apr-2004
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C-circumflex

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"Ĉ", or "ĉ", is a consonant and letter in the Esperanto orthography. Since each letter in Esperanto has a consistent sound, this letter is always pronounced the same; its sound is represented by [tS] in SAMPA and [ʧ] in IPA.

See also: Ĝ, Ĥ, Ĵ, Ŝ, Ŭ