Homo is the genus that comprises the species Homo sapiens, which includes modern humans, as well as several extinct species classified as ancestral to or closely related to modern humans—as for examples Homo habilis and Homo neanderthalensis. The genus is about 2.8 million years old; it first appeared as its earliest species Homo habilis, which emerged from the genus Australopithecus, which itself had previously split from the lineage of Pan, the chimpanzees.

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 difference in energy between these two frontier orbitals can be used to predict the strength and stability of transition metal complexes, as well as the colors they produce in solution.

The Ombudsman against Discrimination on Grounds of Sexual Orientation , also called the Swedish Ombudsman against Discrimination on Grounds of Sexual Orientation and 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.