Question: Which trademark of an American athletic company has been estimated to have a worth of 26 billion dollars?

Context paragraphs:
Great Flood of 1913: The Great Flood of 1913 occurred between March 23 and March 26, after major rivers in the central and eastern United States flooded from runoff and several days of heavy rain.  Related deaths and damage in the United States were widespread and extensive.  While the exact number is not certain, flood-related deaths in Ohio, Indiana, and eleven other states are estimated at approximately 650.  The official death toll range for Ohio falls between 422 and 470.  Flood-related death estimates in Indiana range from 100 to 200.  More than a quarter million people were left homeless.  The death toll from the flood of 1913 places it second to the Johnstown Flood of 1889 as one of the deadliest floods in the United States.  The flood remains Ohio's largest weather disaster.  In the Midwest damage estimates exceeded a third of a billion dollars.  Damage from the Great Dayton Flood at Dayton, Ohio, exceeded $73 million.  Indiana’s damages were estimated at $25 million (in 1913 dollars).  Further south, along the Mississippi River, damages exceeded $200 million.  Devastation from the flood of 1913 and later floods along the Mississippi River eventually changed the country's management of its waterways and increased federal support for comprehensive flood prevention and funding for flood control projects.  The Ohio Conservancy Act, which was signed by the governor of Ohio in 1914, became a model for other states to follow.  The act allowed for the establishment of conservancy districts with the authority to implement flood control projects.

John Calamos: John P. Calamos, Sr. (born 1940) is a Greek–American businessman, mutual fund manager and a self-made billionaire with an estimated net worth of 2.7 billion dollars according to Forbes.  He founded "Calamos Asset Management" in 1977, and won BusinessWeek's best manager for 2003 and 2004 .  He is also a veteran of the Vietnam War, in which he served as a fighter pilot in the Air Force.  Calamos received a bachelor's degree in business and economics from Illinois Institute of Technology in 1963 and an M.B.A. in 1970, and currently serves on the IIT Board of Trustees.

Economy of Myanmar: Myanmar (also known as Burma) is an emerging economy with a nominal GDP of $66.324 billion dollars in 2016 and an estimated purchasing power adjusted GDP of $334.85 billion dollars in 2016.

Four Asian Tigers: The Four Asian Tigers or Four Asian Dragons, are the wealthy high-tech industrialized developed countries of Taiwan, Singapore, Hong Kong (China) and South Korea which underwent rapid industrialization, technological innovation and development and also maintained exceptionally high growth rates (in excess of 7-8 percent a year) between the mid-1950s and early 1990s. The Nominal and Purchasing power parity GDP of these four tigers is 2700 billion Dollars and 4145 billion dollars.These four countries invested heavily in their infrastructure as well as in developing the intellectual abilities of their human talent, fostering and retaining their educated population to help further develop and improve their respective countries.  This policy turned out to be so effective that by the late 20th century, all four countries had developed into advanced and high-income industrialized developed countries, developing many different areas of advanced technology that give them a tremendous competitive advantage in the world.  For example, all four countries have become top level global education centers with Singapore, Taiwan, South Korea and Hong Kong (China) high school students consistently outperforming all other countries in the world and achieving the highest top scores on international math and science exams such as the PISA exam and with Taiwan students winning multiple gold medals every year consistently at the International Biology Olympiad, International Linguistics Olympiad, International Physics Olympiad, International Earth Science Olympiad, International Mathematical Olympiad and International Chemistry Olympiad.

Swoosh: The Swoosh is the logo of American athletic shoe and clothing manufacturer Nike, Inc. Today, it has become one of the most recognizable brand logos in the world, and the most profitable, having a worth of $26 billion alone.

IKEA: IKEA ( or ; ] ) is a multinational group, headquartered in the Netherlands, that designs and sells "," kitchen appliances and home accessories.  It has been the world's largest furniture retailer since at least 2008.  It was founded in Sweden in 1943 by then-17-year-old Ingvar Kamprad, who was listed by "Forbes" Magazine in 2015 as one of the ten richest people in the world, worth more than 40 billion dollars.  The company's name is an acronym that consists of the initials of Ingvar Kamprad (name of founder), Elmtaryd (the farm where he grew up), and Agunnaryd (his hometown in Småland, southern Sweden).  The company is known for its modernist designs for various types of appliances and furniture, and its interior design work is often associated with an eco-friendly simplicity.  In addition, the firm is known for its attention to cost control, operational details, and continuous product development, corporate attributes that allowed IKEA to lower its prices by an average of two to three percent over the decade to 2010 during a period of global expansion.  The IKEA group has a complex corporate structure, which the European Union has alleged was designed to avoid over 1 billion Euros in tax payments over the 2009-2014 period.  It is controlled by several foundations based in the Netherlands, Luxembourg and Liechtenstein.

Björgólfur Guðmundsson: Björgólfur Guðmundsson (born 2 January 1941 in Reykjavík, Iceland) was the chairman and former owner of West Ham United FC.  Björgólfur was Iceland's second businessman worth more than a billion dollars — his son, Björgólfur Thor Björgólfsson being the first.  He was at one time the majority owner and chairman of the now nationalised Icelandic bank Landsbanki, the second largest company in Iceland.  He was ranked by "Forbes" magazine in March 2008 as the 1014th-richest person in the world, with a net worth of $1.1 billion.  In December of the same year Forbes revalued his net worth to $0 and on 31 July 2009 he was declared bankrupt by the Icelandic courts with debts of almost £500 million (96 billion ISK).

Just Do It: Just Do It (stylized as JUST DO IT.)  is a trademark of shoe company Nike, and one of the core components of Nike's brand.  The slogan was coined in 1988 at an advertising agency meeting.  The founder of Wieden+Kennedy agency, Dan Wieden credits the inspiration for his "Just Do It" Nike slogan to Gary Gilmore’s last words: "Let's do it."  The "Just Do It" campaign allowed Nike to further increase its share of the North American domestic sport-shoe business from 18% to 43%, (from $877 million to $9.2 billion in worldwide sales) from 1988 to 1998.  In many Nike-related situations, "Just Do It" appears alongside the Nike logo, known as the Swoosh.

Sandro Veronesi (entrepreneur): Sandro Veronesi is an Italian entrepreneur, and founder of the Calzedonia Group.  This corporation consists of Calzedonia, Intimissimi, Tezenis, Falconeri, Signorvino, Atelier Emé and Cash & Carry.  According to the Forbes list of billionaires, Sandro Veronesi is one of the richest people in the world, with a net worth of over one billion dollars.  His net worth in 2013 was estimated at $1.8 billion.

Venmo: Venmo is a mobile payment service owned by PayPal.  It allows users to transfer money between one another using a mobile phone app or web interface.  It handled 17.6 billion dollars in transactions in 2016 and 6.8 billion dollars in transactions in Q1 of 2017 which more than doubled its volume in Q1 of 2016.

Supporting paragraphs: Just Do It Swoosh
Answer: Swoosh