BBDO Worldwide has been named the "Most Awarded Agency Network in the World" by The Gunn Report for six consecutive years beginning 2005. It has won "Network of the Year" at the Cannes Lions five times. With more than 15,000 employees in 289 offices in 80 countries, it is the largest of three global networks (BBDO, DDB, TBWA) of agencies in Omnicom's portfolio.
BBDO was named Global Agency of the Year by Adweek in 2011. It has also been named Agency of the Year in 2005 by Adweek, Advertising Age, and Campaign. In 2006, Mayor Michael Bloomberg proclaimed January 10 as BBDO day in recognition of the strength of its advertising, as well as its contributions to New York City.
The Barton & Durstine agency (founded by Bruce Fairchild Barton and William H. Johns) opened in January 1919, and when Alex Osborn joined the company, the company was named Barton, Durstine, and Osborn. In 1928, the Batten Company (then managed by William H. Johns) merged with Barton, Durstine, and Osborn to form BBDO. The second B represents Barton.
According to wikipedia