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I think its the hotel flag, but either way its flapping
A flag with two red flags horizontal from each other
The SYN flag is a 1-bit flag in the TCP header used to indicate the initial value of the sequence number. It is only set in the first two segments of the three-way TCP connection establishment sequence.
Maritime flags indicate this with two square red flags with a black square in the middle of each
"Warnung bei" is German for "warning at" or "warning about." It is often used in the context of alerts or notifications to indicate that there is some impending danger, issue, or important information that needs to be acknowledged.
A yellow jack is a flag used by ships as a warning of disease on the ship, or a fish, Latin name Caranx bartholomaei.
A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Internationally, the code flag alfa/alpha, which is white and blue, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed. In North America it is conventionally red with a white stripe from the upper left corner to the lower right corner.
A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Internationally, the code flag alfa/alpha, which is white and blue, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed. In North America it is conventionally red with a white stripe from the upper left corner to the lower right corner.
A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Internationally, the code flag alfa/alpha, which is white and blue, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed. In North America it is conventionally red with a white stripe from the upper left corner to the lower right corner.
The color white is commonly associated with surrender. In some cultures, a white flag is used to indicate surrender during conflicts or negotiations.
Red or orange flares/smoke always indicate danger. Bright white flares indicate no danger, but just a warning to other vessels regarding position of the vessel from which the flare is fired, thus helping to avoid a collision. White flares can also be used to illuminate the sea around the vessel in the event of somebody overboard.
The dive flag was first used in the early 1950's D.J. Dockery a former member of the U.S.navy designed the flag to use with his homemade scuba gear. The familiar red flag with white stripe running from upper left corner to lower right corner has become known as the warning that there is a "diver down".