The G-circumflex reference article from the English Wikipedia on 24-Jul-2004
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G-circumflex

Helping orphans the way you would do it
"Ĝ", or "ĝ", is a consonant and letter in the Esperanto alphabet. Since each letter in Esperanto has a consistent sound, this letter is always pronounced the same; its sound is represented by [dZ] in SAMPA and [ʤ] in IPA.

The letter is also used in Unangam Tunuu (see Aleut language), where it represents a voiced uvular fricative. The corresponding voiceless sound is represented by x̂.

See also: Esperanto orthography, Ĉ, Ĥ, Ĵ, Ŝ, Ŭ