BMX Logos
BMX logos are what a company uses to represent itself and to symbolise its products. By using a BMX logo they can allow any rider to distinguish the company by simply seeing it. A number of BMX company logos can be seen below.

As you can see there is a large number of logos here ranging from the street bmx brand subrosa to the park bmm brand we the people, all the way to Nike 6.0. These BMX logos can be purchased as stickers and placed on your bike, they can be placed on box jumps, spines and halfpipes, they can even be used as flags at competitions.
These bmx logos are what helps each of the bmx companies to get their product recognised in the industry. It is the same concept as with any form of advertising and works in the same way. If you want to see more of these bmx logos or perhaps purchase some to stick them on something, your best bet is to search for the brand specifically and go to the main web page for that company. Many of the companies will send you out a sticker pack if you email them and ask nicely. Perhaps even attaching a photo of yourself riding would help to get you some for free or at a reduced price.
In summary BMX logos are extremely important and they can be used to decorate your bike and make it look professional!