High Quality Content by WIKIPEDIA articles! The Cubs Win Flag is a victory flag that is flown at Wrigley Field after every Chicago Cubs home win. The flag is variously referred to by approximately a dozen names, combining; either Cubs or Chicago Cubs; Win, W, White, White W, or W Win; and flag, banner or banner flag. Other common names for the symbol include Chicago Cubs W Win Flag and Chicago Cubs Win Banner Flag. It has become an important symbol for fans that one retailer describes as a fan banner instead of flag, or banner flag. In addition, days when the win flag is flown are known as "White Flag Days". The tradition of flying a win or loss flag over the stadium began soon after the construction of the scoreboard in 1937.