HRH is an abbreviation for His Royal Highness or Her Royal Highness. It appears in front of the names of members of a Royal family other than the King or Queen. In the British monarchy the title of HRH is associated with the rank of prince or princess. This is especially important when a prince has another title such as Duke (or a princess the title of Duchess) by which he or she would usually be addressed. For instance HRH The Duke of Connaught and Strathearn was a prince and a member of the royal family while His Grace The Duke of Devonshire is a non-royal duke and not a member of the British royal family.
HRH is a clinical abbreviation for "High-Risk Heterosexual", often used by the United States Centers for Disease Control and Prevention and state and local Health Departments to classify at-risk populations for HIV/AIDS or other STD infections.
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