Highness

Highness (abbreviation HH, oral address Your Highness) is a formal style used to address (in second person) or refer to (in third person) certain members of a reigning or formerly reigning dynasty. It is typically used with a possessive adjective: "His Highness", "Her Highness" (HH), "Their Highnesses", etc. Although often combined with other adjectives of honour indicating rank, such as "Imperial", "Royal" or "Serene", it may be used alone.

Highness is, both literally and figuratively, the quality of being lofty or above. It is used as a term to evoke dignity or honour, and to acknowledge the exalted rank of the person so described.