Homo is the genus that includes modern humans and species closely related to them. The genus is estimated to be about 2.3 to 2.4 million years old, evolving from australopithecine ancestors with the appearance of Homo habilis. Specifically, H. habilis is assumed to be the direct descendant of Australopithecus garhi which lived about 2.5 million years ago. However in May 2010, H. gautengensis was discovered, a species believed to be even older than H. habilis.

HOMO and LUMO are acronyms for highest occupied molecular orbital and lowest unoccupied molecular orbital, respectively. The energy difference between the HOMO and LUMO is termed the HOMO-LUMO gap. HOMO and LUMO are sometimes referred to as frontier orbitals.

The Swedish Ombudsman against Discrimination on Grounds of Sexual Orientation (Ombudsmannen mot diskriminering på grund av sexuell läggning), normally referred to as HomO, was the Swedish office of the ombudsman against discrimination on grounds of sexual orientation. On January 1, 2009, it was merged with other ombudsman officers into the new Discrimination Ombudsman.