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

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"Ĥ", or "ĥ", 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 [x] in SAMPA and IPA.

In the case of the minuscule, some fonts place the circumflex over the mast of the h; others over the n-like part, beside the mast; and others, centred above the entire letter.

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