Muhammad Ali - born Cassius Marcellus Clay (January 17, 1942 – June 3, 2016) - was an American professional boxer, activist, and philanthropist. Nicknamed "The Greatest", he is widely regarded as one of the most significant and celebrated sports figures of the 20th century, and as one of the greatest boxers of all time. Born and raised in Louisville, Kentucky, Clay began training as an amateur boxer at age 12. At age 18, he won a gold medal in the light heavyweight division at the 1960 Summer Olympics, and turned professional later that year. He converted to Islam after 1961, and eventually took the name Muhammad Ali. At age 22, in 1964, he won the world heavyweight championship from Sonny Liston in a major upset. Ali was one of the leading heavyweight boxers of the 20th century, and remains the only three-time lineal champion of that division. His records of beating 21 boxers for the world heavyweight title and winning 14 unified title bouts were unbeaten for 35 years.[note 1] At a time when most fighters let their managers do the talking, Ali thrived in and indeed craved the spotlight, where he was often provocative and outlandish.[11][12][13] He was known for trash-talking, and often freestyled with rhyme schemes and spoken word poetry, both for his trash-talking in boxing and as political poetry for his activism, anticipating elements of rap and hip hop music.[14][15][16] Ali is the only boxer to be named The Ring magazine Fighter of the Year six times. Due to his involvement in several historic boxing matches and feuds,[17] and his boxing records, he has been ranked the greatest heavyweight boxer of all time, and as the greatest athlete of the 20th century by Sports Illustrated, the Sports Personality of the Century by the BBC, and the third greatest athlete of the 20th century by ESPN SportsCentury.[18][19]

A warning sign is a type of sign which indicates a potential hazard, obstacle or condition requiring special attention. Some are traffic signs that indicate hazards on roads that may not be readily apparent to a driver.[1] While warning traffic sign designs vary, they usually take the shape of an equilateral triangle with a white background and thick red border. In the People's Republic of China (except for Macau and Hong Kong), they appear with a black border and a yellow background. In Sweden, Serbia, Bosnia and Herzegovina, Greece, Finland, Iceland, the Republic of Macedonia and Poland, they have a red border with an amber background. The polar bear warning sign in Svalbard recently changed from displaying a black bear on white background to a white bear on black background (both signs are triangular with a red border). Some countries (like France, Norway and Spain) that normally use a white background have adopted an orange or amber background for road work or construction signs. Warning signs in some countries have a diamond shape in place of the standard triangular shape. In the United States, Canada, Mexico, Thailand, Australia, Japan, Indonesia, Malaysia, New Zealand[2], most of South America, and also Ireland (diverging from the standards of the rest of Europe) use warning signs are black on a yellow background and usually diamond-shaped, while temporary signs (which are typically construction signs) are black on an orange background. Some other countries also use these standards for some signage. The warning signs usually contain a symbol. In Europe they are based on the UNECE Vienna Convention on Road Signs and Signals. In the United States they are based on the MUTCD standard and often contain text only.

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