Meaning
This flag stands for Svalbard and Jan Mayen, Norwegian Arctic islands far to the north. They have no flag of their own and use the flag of Norway.
It appears in polar travel posts about polar bears, glaciers, the midnight sun and the long polar night, and in news about the global seed vault, with 🧊 or ❄️. “Midnight sun and not a single polar bear yet 🇸🇯🧊”