I noticed how many logos are two letters in a circle.
Apparently, I didn't, because I could only find these 10.
Auto Carriers Ltd. : A c
Detective Comics Comics, Inc. : D C
Electronic Arts Inc. : E a
General Electric Company : G e
Hewlett-Packard Company : H p
Lucky-Goldstar Corparation : L g
Northwest Airlines Corp. (Former Logo, 2003) : N w
Procter & Gamble Co. : P &
Volkswagen : V W
76 : 7 6