HI or Hi may refer to:
Hillary Diane Rodham Clinton (; born October 26, 1947) is an American politician who was the 67th United States Secretary of State from 2009 to 2013, U.S.
Human immunodeficiency virus infection and acquired immune deficiency syndrome (HIV/AIDS) is a spectrum of conditions caused by infection with the human immunodeficiency virus (HIV).
Hindi (Devanagari: हिन्दी, IAST: Hindī), or Modern Standard Hindi (Devanagari: मानक हिन्दी, IAST: Mānak Hindī) is a standardised and Sanskritised register of the Hindustani language.
The Higgs boson is an elementary particle in the Standard Model of particle physics. It is the quantum excitation of the Higgs field, a fundamental field of crucial importance to particle physics theory first suspected to exist in the 1960s.
A hijab (, , or ; Arabic: حجاب ḥijāb, pronounced [ħiˈdʒæːb] or [ħiˈɡæːb]) is a veil traditionally worn by Muslim women in the presence of adult males outside of their immediate family, which usually covers the head and chest.
The date of the start of the history of the United States is a subject of debate among historians. Older textbooks start with the arrival of Christopher Columbus on October 12, 1492 and emphasize the European background of the colonization of the Americas, or they start around 1600 and emphasize the American frontier.