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 and 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.

The flag has used two different color schemes with the letter "W" on a solid background, and there is a loss indicator flag with a letter "L".
 Additionally, the flags have been complemented by different color schemes of indicator lights.
The flag is also changed after each Cubs win.
The flag has become a very symbolic emblem for devout Cubs fans.
 Some retailers sell slightly different versions that also have the Cubs logo at the bottom.
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 and 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.
The flag has used two different color schemes with the letter "W" on a solid background, and there is a loss indicator flag with a letter "L".  Additionally, the flags have been complemented by different color schemes of indicator lights. The flag is also changed after each Cubs win. The flag has become a very symbolic emblem for devout Cubs fans.  Some retailers sell slightly different versions that also have the Cubs logo at the bottom.
Cubs Win Flag