Hhok

ha ha only kidding. See ha ha only serious.
[Jargon File]
ha-ha, only kidding

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H-hour
[eych-ouuh r, -ou-er] /ˈeɪtʃˌaʊər, -ˌaʊ ər/ noun 1. the time, usually unspecified, set for the beginning of a planned attack. noun 1. (military) the specific hour at which any operation commences Also called zero hour
HHS
1. . [Department of] Health and Human Services
Hht
Hereditary Hemorrhagic Telangiectasia Foundation International