Check (pattern) a board used for playing checkers and chess, and in heraldry. The check pattern has a number of symbolic meanings. In auto racing, the chequered flag is displayed at the finishing line to signal that the race has finished. It originates from the "checkers" who watched the finishing line and checked when cars had finished the race. They began using chequered flags to identify themselves. In some countries, the check pattern has become a symbol of the police. Known as "Sillitoe Tartan", it was first used in Glasgow in the 1930s and was inspired by a pattern worn by some
City of Glasgow Police had little effect. A night of further rioting followed which resulted in the Army being called to assist the Police. By the following morning, tanks were deployed in George Square and machine gun crews occupied the roofs of the buildings overlooking it. In 1931, cuts in Government benefits lead to marches by the unemployed and riots in Glasgow Green, Saltmarket, and Jail Square. Fifty-one men were arrested. Glasgow's first radio patrol car system was put into operation in May 1936. In 1939, on the outbreak of Second World War, the Glasgow Police prepared and established the Air Raid Precautions Service.