G4

G4 or G-4 is the name of:

G4 nations – four major nations seeking seats on the UN Security Council: Germany, Brazil, Japan, and India.
G4 bloc – China, India, Brazil, and South Africa—the core leadership of the larger G20 trade bloc within the World Trade Organization.
Group 4 of the periodic table.
PowerPC G4 – a type of microprocessor used by Apple Computer.
G4 (TV channel) – a male-oriented (formerly video game oriented) TV channel.
G4 (band) – a pop group on the ITV television programme The X Factor.
G4 is the IATA code for Allegiant Air
G4 star – a subclass of G-class stars.
Gulfstream G400 and G450 – private jets.
Santa Clara County Route G4 – a county highway in Santa Clara County, California, USA.
A former VIP unit of the Hong Kong Police Force.