Just think about your question for a moment. Do you really believe that anyone can know how many logos there are in the world? How could such knowledge possibly be acquired? Not all questions that can be asked can be answered, and this one can't.
A lot
One can see a number of famous logos from around the world on the website 'famouslogos' where they have a number from cars, TV, drinks and sports. One can also see famous logos on 'Brands of the World'.
over millions
According to Bizcovering, the 10 instantly recognized world famous logos are:GoogleStarbuckseBayFedExPlayStationCoca-ColaMicrosoftAppleNikeUPS
There are many different Christmas icons or logos that are easily recognizable. One of the most recognizable logos is the Christmas Tree. Another popular icon is Santa Claus. One of the other popular icons is a sled pulled by reindeer.
The Padres have used 10 primary logos and 10 alternate logos through the 2012 season. Click on the "Padres Logos" link below to view all Padres logos (primary, alternate, cap, etc.).
There are many sites that offer custom business logos. Some of the sites that will create logos for businesses include Logoyes, Businesslogos, and Logodesignguru.
Coke McDonalds
Many websites provide the history of the internet explorer logos. Websites such as Wikipedia, TheFontFeed, and the Internet Archive provide the history of internet logos.
There are many thousands of pizza places and logos. It would be impractical to try to list them here.
There many stock logos on internet. Iconshock.com is one of stock logos site that provides many samples logo for your organization or company. You can visit www.iconshock.com.
Rationalism
Car logos have not changed much over the years. Many of the chrome logos are still mounted on the car in the exact same fashion as it was 20 years ago.