General Electrics. They use the GE.
Barclays uses a blue eagle as their logo.
Kmart uses a K as its logo.
The Coleman company
Gucci has a logo with G and backwards G.
The company logo with a blue square and white G is for Gap. Gap is an American retail company founded in 1969.
Ford motor company
Greenpeace
Gigasat
Nickelodeon
Westinghouse
The WWF - World Wildlife Federation uses a panda in its logo.