G0, G0, G0, or g0 may refer to: G0 phase of cell division G0 star, a subclass of G-class stars Ghana International Airlines IATA airline designator Ground zero, sometimes used as an abbreviation to refer to the World Trade Center site of the 9/11 attacks Group 0, an alternate name for Group 18 of the Periodic table – the Noble gases a hypothetical group in the Periodic table, which would consist of neutronium Geometric continuity, notated G0 Standard gravity, notated g0 Quantum of conductance, notated G0 G-Zero world – the term used for the emerging vacuum in international politics in the early 21st Century.