Hospital Insurance hazard index Hearing Impaired High Health Insurance homicidal ideation Handicap International Hawaii Health Informatics hemagglutination-inhibition Honeywell, Inc. head injury heading indicator Heat Index hemagglutination inhibition High Impedance high-intensity histamine hormone-independent Host Identity Human Interaction Human Interface humoral immunity Hydraulic Institute hypomelanosis of Ito haemagglutination inhibition haemagglutination inhibition test haemagglutination-inhibiting haemagglutination-inhibition haemagglutination-inhibition tests haemagglutinin inhibition Haemophilus influenzae Hail Index HA-inhibition Half-Interval Hamersley Iron Hampton Institute Handover Initiation Handover Interface Hanford Information