 The correct 3-letter abbreviation for the city, taken from the acronym for Hobby Airport.Houston is popularly known as "The Bayou City" (and less frequently as "Baghdad on the Bayou") because it is home to ten winding waterways that flow through the surrounding area.Buffalo Bayou is the main waterway flowing through the city and has a significant place in Texas history, not only due to the founding place of the City of Houston, but also because the final battle for Texas Independence was fought along its banks.